Rust SpeedSheet

https://speedsheet.io/s/rust
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A comprehensive Rust language reference with real-time search, providing quick access to syntax,...
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### Install Rust Target for Windows ARM

Source: https://speedsheet.io/s/rust?q=command-line-only

Installs the target for Windows on ARM architecture. Requires a stable toolchain for the target. This example shows installing the target and then building a release.

```bash
rustup target add i686-pc-windows-msvc
rustup toolchain install stable-i686-pc-windows-msvc
cargo build --release --target i686-pc-windows-msvc
```

--------------------------------

### Install Rust using rustup on Linux/Mac

Source: https://speedsheet.io/s/rust

Execute this script to install rustup, the Rust toolchain installer, on Linux and macOS systems.

```bash
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
```

--------------------------------

### Using Setup Function in Test

Source: https://speedsheet.io/s/rust?q=tests-only

Call the custom `setup()` function within a test to initialize test data.

```rust
#[test]
fn some_test() {
  let test_data = setup();
  ...
}
```

--------------------------------

### Setup Function for Test Fixtures

Source: https://speedsheet.io/s/rust?q=tests-only

Implement custom `setup()` functions to prepare test environments, as Rust does not have built-in test fixture management.

```rust
fn setup() -> setup_data_type {
  ...
}
```

--------------------------------

### List Installed Rustup Components

Source: https://speedsheet.io/s/rust?q=command-line-only

Use this command to see all components currently installed in your Rust toolchain.

```bash
rustup component list --installed
```

--------------------------------

### Install evcxr_repl (Rust REPL)

Source: https://speedsheet.io/s/rust_tools

Install evcxr_repl, an interactive Read-Eval-Print Loop for Rust, which converts code into a main() function for execution.

```bash
rustup component add rust-src
```

```bash
cargo install evcxr_repl
```

--------------------------------

### Install Rust Target for Web Assembly

Source: https://speedsheet.io/s/rust?q=command-line-only

Installs the target for Web Assembly. This is an experimental target and may be incomplete.

```bash
rustup target add wasm32-unknown-unknown
cargo build --release --target wasm32-unknown-unknown
```

--------------------------------

### Install Rust Target for Raspberry Pi 4 (64-bit)

Source: https://speedsheet.io/s/rust?q=command-line-only

Installs the target for a 64-bit Raspberry Pi 4. Requires `arm-linux-gnueabihf-binutils` and `brew install arm-linux-gnueabihf-binutils`. This target is for ARMv7-A Linux with hardfloat.

```bash
rustup target add armv7-unknown-linux-gnueabihf
cargo build --release --target armv7-unknown-linux-gnueabihf
```

--------------------------------

### Install Rust Analyzer preview component

Source: https://speedsheet.io/s/rust_tools

Install the preview version of the Rust Analyzer Language Server Protocol (LSP) component for enhanced IDE support.

```bash
rustup +nightly component add rust-analyzer-preview
```

--------------------------------

### Example: Displaying a Point Struct

Source: https://speedsheet.io/s/rust?q=display-only+trait

This example demonstrates how to implement the Display trait for a custom struct 'Point' to format its x and y coordinates as a string.

```Rust
use std::fmt;
use std::fmt::Display;
use std::fmt::Formatter;

struct Point {
    x: i32,
    y: i32,
}

impl Display for Point {
    fn fmt(&self, formatter: &mut Formatter) -> fmt::Result {
        write!(formatter, "{}, {}", self.x, self.y)
    }
}

fn main() {
    let point = Point { x: 3, y: 4 };
    println!("Point: {}", point);
}
```

--------------------------------

### Install Rust Target for Raspberry Pi (32-bit)

Source: https://speedsheet.io/s/rust?q=command-line-only

Installs the target for a 32-bit Raspberry Pi. Requires `arm-linux-gnueabihf-binutils` and `brew install arm-linux-gnueabihf-binutils`. This target is for ARMv6 Linux with hardfloat.

```bash
rustup target add arm-unknown-linux-gnueabihf
cargo build --release --target arm-unknown-linux-gnueabihf
```

--------------------------------

### Creating Vec from a Start Index with Step

Source: https://speedsheet.io/s/rust?q=%3A%3Avec

Shows how to create a new Vec starting from a specific index to the end, selecting elements with a step.

```rust
let from_with_step: Vec<_> = vec_1[start..].iter().step_by(step).cloned().collect();
```

--------------------------------

### Run evcxr_repl

Source: https://speedsheet.io/s/rust_tools

Start the evcxr_repl interactive session for Rust.

```bash
evcxr
```

--------------------------------

### Install Rust using Homebrew on Mac

Source: https://speedsheet.io/s/rust

Use this command to install the Rust programming language via Homebrew on macOS.

```bash
brew install rust
```

--------------------------------

### Example Function - Square

Source: https://speedsheet.io/s/rust

An example function that calculates the square of a given f64 value.

```rust
fn square(value: f64) -> f64 { return value }
```

--------------------------------

### Install Clippy with Pedantic and Nursery lints

Source: https://speedsheet.io/s/rust_tools

Use this command to install Clippy with strict linting configurations, including pedantic and nursery levels, and to warn about the use of unwrap and expect.

```bash
cargo clippy --fix -- -W clippy::pedantic -W clippy::nursery -W clippy::unwrap_used -W clippy::expect_used
```

--------------------------------

### Install Rust Target for Windows ARM

Source: https://speedsheet.io/s/rust

Installs the target for compiling Rust code for Windows on ARM architecture. Requires `stable-i686-pc-windows-msvc` toolchain and `cargo build --release --target i686-pc-windows-msvc`. The `brew install` command is an alternative for obtaining the toolchain.

```bash
rustup target add i686-pc-windows-msvc
```

```bash
rustup toolchain install stable-i686-pc-windows-msvc
```

```bash
cargo build --release --target i686-pc-windows-msvc
```

```bash
brew install stable-i686-pc-windows-msvc
```

--------------------------------

### Array Slicing Examples in Rust

Source: https://speedsheet.io/s/rust?q=array-only

Demonstrates various ways to slice arrays in Rust to access elements or sub-arrays. Note that slicing operations like `[start..]` or `[..end]` create slices, which are then often converted to `Vec` for further use.

```rust
let first = array_1[0];
let nth = array_1[n];
let second_last = array_1[array_1.len() - 2];
let last = array_1[array_1.len() - 1];
let all_but_first: Vec<_> = array_1[1..].to_vec();
let all_but_last: Vec<_> = array_1[..array_1.len() - 1].to_vec();
let reversed: Vec<_> = array_1.iter().rev().cloned().collect();
let from: Vec<_> = array_1[start..].to_vec();
let to: Vec<_> = array_1[..end_plus_1].to_vec();
let step_over: Vec<_> = array_1.iter().step_by(step).cloned().collect();
let from_to: Vec<_> = array_1[start..=end].to_vec();
let from_to: Vec<_> = array_1[start..end_plus_1].to_vec();
let from_to_with_step: Vec<_> = array_1[start..=end].iter().step_by(step).cloned().collect();
let from_to_with_step: Vec<_> = array_1[start..end_plus_1].iter().step_by(step).cloned().collect();
let from_with_step: Vec<_> = array_1[start..].iter().step_by(step).cloned().collect();
```

--------------------------------

### Install Rust Target for Windows Intel

Source: https://speedsheet.io/s/rust

Installs the target for compiling Rust code for Windows on Intel x86_64 architecture. Preferred method uses `x86_64-pc-windows-msvc`. Usage requires `stable-x86_64-pc-windows-msvc` toolchain and `cargo build --release --target stable-x86_64-pc-windows-msvc`. The `brew install` command is an alternative for obtaining the toolchain.

```bash
rustup target add x86_64-pc-windows-msvc
```

```bash
rustup target add x86_64-pc-windows-gnu
```

```bash
rustup toolchain install stable-x86_64-pc-windows-msvc
```

```bash
cargo build --release --target stable-x86_64-pc-windows-msvc
```

```bash
brew install stable-x86_64-pc-windows-msvc
```

--------------------------------

### List All Available Rust Targets

Source: https://speedsheet.io/s/rust?q=command-line-only

Displays a comprehensive list of all targets that can be installed and used with rustup.

```bash
rustup target list
```

--------------------------------

### Install Rust Target for Windows Intel (GNU)

Source: https://speedsheet.io/s/rust?q=command-line-only

Installs the target for Windows on Intel x86_64 architecture using the GNU toolchain. This is an alternative for non-Windows systems.

```bash
rustup target add x86_64-pc-windows-gnu
```

--------------------------------

### Get Clippy Help

Source: https://speedsheet.io/s/rust?q=command-line-only

Use this command to display the help message for Clippy, listing all available options and configurations.

```bash
cargo clippy -- -h
```

--------------------------------

### Install Rust Target for MacOS x86

Source: https://speedsheet.io/s/rust?q=command-line-only

Installs the target for MacOS on x86 architecture. This command is typically followed by a build command specifying the target.

```bash
rustup target add x86_64-apple-darwin
cargo build --release --target x86_64-apple-darwin
```

--------------------------------

### Install Cargo Fuzz

Source: https://speedsheet.io/s/rust_tools

Install Cargo Fuzz, a tool designed for fuzz testing applications by randomly generating data to discover potential issues.

```bash
cargo install cargo-fuzz
```

--------------------------------

### Rust Identifiers Examples

Source: https://speedsheet.io/s/rust

Provides examples of valid and invalid identifiers in Rust, following the naming conventions.

```rust
_identifier identifier 식별자 item_1
```

```rust
_ 
3_items 
🎈
```

--------------------------------

### Install Rust Target for Raspberry Pi (32 bit)

Source: https://speedsheet.io/s/rust

Installs the target for compiling Rust code for a 32-bit Raspberry Pi. Requires `arm-linux-gnueabihf-binutils` and `cargo build --release --target arm-unknown-linux-gnueabihf` to use the installed target. Notes that this is for ARMv6 Linux with hardfloat.

```bash
rustup target add arm-unknown-linux-gnueabihf
```

```bash
brew install arm-linux-gnueabihf-binutils
```

```bash
cargo build --release --target arm-unknown-linux-gnueabihf
```

--------------------------------

### Install Rust Target for Raspberry Pi 4 (64 bit)

Source: https://speedsheet.io/s/rust

Installs the target for compiling Rust code for a 64-bit Raspberry Pi 4. Requires `arm-linux-gnueabihf-binutils` and `cargo build --release --target armv7-unknown-linux-gnueabihf` to use the installed target. Notes that this is for ARMv7-A Linux with hardfloat.

```bash
rustup target add armv7-unknown-linux-gnueabihf
```

```bash
brew install arm-linux-gnueabihf-binutils
```

```bash
cargo build --release --target armv7-unknown-linux-gnueabihf
```

--------------------------------

### Install Rust Target for Windows Intel (MSVC)

Source: https://speedsheet.io/s/rust?q=command-line-only

Installs the target for Windows on Intel x86_64 architecture using the MSVC toolchain. This is the preferred method for Windows Intel targets.

```bash
rustup target add x86_64-pc-windows-msvc
rustup toolchain install stable-x86_64-pc-windows-msvc
cargo build --release --target stable-x86_64-pc-windows-msvc
```

--------------------------------

### Get Rust Compiler Version

Source: https://speedsheet.io/s/rust?q=command-line-only

Displays the installed version of the Rust compiler.

```rust
rustc -V
```

```rust
rustc --version
```

--------------------------------

### Hello World - Name from Command Line Arguments

Source: https://speedsheet.io/s/rust

Greets a user by name, taking the name from command-line arguments. Prints usage instructions if no name is provided. Joins multiple arguments into a single name string.

```rust
use std::env::args; fn main() { let args: Vec<String> = args().collect(); if args.len() < 2 { println!("Usage: {} NAME", args[0]); return; } let name = &args[1..].join(" ");; println!("Hello, {}!", name); }
```

--------------------------------

### Install Miri for undefined behavior detection

Source: https://speedsheet.io/s/rust_tools

Install Miri, Rust's tool for detecting undefined behavior in unsafe code by running it in an interpreter.

```bash
rustup +nightly component add miri
```

--------------------------------

### Get Match Start Position

Source: https://speedsheet.io/s/rust_regex?q=match-only

Returns the index of the first character of the matched text.

```rust
match_1.start()
```

--------------------------------

### Hello World with Command Line Arguments in Rust

Source: https://speedsheet.io/s/rust?q=hello+world

This example shows how to access and use command-line arguments provided when running the program. It joins all arguments after the program name into a single string for the greeting and includes a usage message if no arguments are provided.

```rust
use std::env::args;

fn main() {
    let args: Vec<String> = args().collect();
    if args.len() < 2 {
        println!("Usage: {} NAME", args[0]);
        return;
    }
    let name = &args[1..].join(" ");;
    println!("Hello, {}!", name);
}
```

--------------------------------

### Variable Scope Example

Source: https://speedsheet.io/s/rust?q=variables-only

Demonstrates global, local, and block scopes, as well as shadowing of variables.

```rust
static global_variable:i32 = 1;
fn func1() {
    let local_variable = 2;
    {
        let block_variable = 3;
    }
}
```

```rust
fn func1() {
    let variable_1 = 1;
    {
        // Block, Shadows Outer Variable:
        let variable_1 = 2;
    }
}
```

```rust
let a = 1;
println!("local a = {}", a);
{
    let a = 2;
    println!("block a = {}", a);
}
println!("local a = {}", a);
```

--------------------------------

### Rust Match Expression Example

Source: https://speedsheet.io/s/rust?q=control-structure-only

A practical example of a match expression returning a string value based on an integer input. It demonstrates handling specific values and a default case.

```rust
let value = 200;
let returned_value = match value {
    200 => { "OK" },
    400 => { "Bad Request" },
    500 => { "Server Error" },
    _ => { "Unknown" }
};
println!("Returns {}.", returned_value);
```

--------------------------------

### Documentation Comment

Source: https://speedsheet.io/s/rust?q=symbols-only

Triple slashes `///` start a documentation comment that generates documentation for the following item.

```rust
///
```

--------------------------------

### Basic CLAP CLI Argument Parsing

Source: https://speedsheet.io/s/rust_tools

An example of setting up a command-line interface using the CLAP crate, including version, author, and arguments.

```rust
fn clap_main() {
    let _matches = clap_app!(
        myapp =>
            (version: "1.0")
            (author: "Alice A. <alice@example.com>")
            (about: "Does awesome things")
            (@arg CONFIG: -c --config +takes_value "config")
            (@arg debug: -d ... "Sets debugging level")
            (@subcommand test =>
                (about: "controls testing features")
                (@arg verbose: -v --verbose "Verbose test")
    )
    .get_matches();
    // Handle cli args from here
}
```

--------------------------------

### Trie - Get Prefixed Subtree

Source: https://speedsheet.io/s/rust_radix_trie

Retrieves a subtree containing all entries that start with a given prefix.

```APIDOC
## Trie - Get Prefixed Subtree

### Description
Returns all items that start with the partial key.

### Method
`get_raw_descendant`

### Parameters
- **partial_key** (string) - Required - The prefix to search for.

### Returns
`SubTrie` - A SubTrie containing entries that match the prefix.

### Request Example
```rust
trie.get_raw_descendant("prefix");
```
```

--------------------------------

### Async SQL Query with Sqlx

Source: https://speedsheet.io/s/rust_tools

Shows how to establish a connection to a PostgreSQL database and execute a query using the sqlx crate. This example requires a running PostgreSQL instance and the sqlx crate with the 'postgres' feature enabled.

```Rust
async fn sqlx() {
    use sqlx::postgres::PgPool;
    let pool = PgPool::connect("localhost").await.unwrap();
    #[derive(sqlx::FromRow)]
    struct User {
        name: String,
        id: i64,
    }
    let _stream = sqlx::query_as::<_, User>(
        "SELECT * FROM users WHERE email = ? OR name = ?"
    )
    .bind("test@example.com")
    .bind("test")
    .fetch_all(&pool);
}
```

--------------------------------

### Get Match Range

Source: https://speedsheet.io/s/rust_regex?q=match-only

Returns a range representing the start and end indices of the matched text.

```rust
match_1.range()
```

--------------------------------

### Get Substring from Start to Index (ASCII)

Source: https://speedsheet.io/s/rust?q=string-only

Extracts a substring from the beginning of an ASCII string up to a specified index.

```rust
let string_1 = "12345".to_string();
let start_to_index_3 = &string_1[..4]; // "1234"
```

--------------------------------

### Get Prefixed Subtree from Trie in Rust

Source: https://speedsheet.io/s/rust_radix_trie

Returns a `SubTrie` containing all items that start with the given partial key.

```rust
// Assuming trie_1 is a valid Trie instance
// let subtrie = trie_1.get_raw_descendant(partial_key);
```

--------------------------------

### Get Range of Match

Source: https://speedsheet.io/s/rust_regex

The `range` method returns a `Range<usize>` representing the start and end indices of the matched text within the original string.

```rust
= match_1.range()
```

--------------------------------

### Install Rust Target for MacOS Apple Silicon

Source: https://speedsheet.io/s/rust?q=command-line-only

Installs the target for MacOS on Apple Silicon (aarch64). This is often used before building a release for this specific architecture.

```bash
rustup target add aarch64-apple-darwin
cargo build --release --target aarch64-apple-darwin
```

--------------------------------

### Get Middle Substring with Skip and Take (Unicode)

Source: https://speedsheet.io/s/rust?q=string-only

Extracts a middle substring using `skip` and `take` with explicit start and end calculations for Unicode strings.

```rust
let text = "12345".to_string();
let middle = text.chars().skip(1).take(4 - 1).collect::<String>(); // "234"
```

--------------------------------

### Install Cargo LLVM Cov for code coverage

Source: https://speedsheet.io/s/rust_tools

Install the Cargo LLVM Cov tool, which provides unit test code coverage analysis using LLVM.

```bash
cargo install cargo-llvm-cov
```

--------------------------------

### File - Get File Length

Source: https://speedsheet.io/s/rust?q=files-only

Gets the length of a file in bytes.

```APIDOC
## File - Get File Length

### Description
Returns the length of the file in bytes.

### Method
`metadata.len()`

### Parameters
#### Path Parameters
- **metadata** (Metadata) - Required - The metadata object obtained from `std::fs::metadata()`.

### Returns
- **u64** - The length of the file in bytes.

### Example
```rust
use std::fs::metadata;
let metadata = metadata("path/to/your/file")?;
let file_length = metadata.len();
```
```

--------------------------------

### Invalid Identifier Examples

Source: https://speedsheet.io/s/rust?q=fundamentals-only

Shows examples of identifiers that are not allowed in Rust.

```Rust
_ 
3_items 
🎈
```

--------------------------------

### Compile and Run Application

Source: https://speedsheet.io/s/rust?q=command-line-only

Compiles the project if necessary and then runs the main application binary.

```rust
cargo run
```

--------------------------------

### Create Full Directory Path

Source: https://speedsheet.io/s/rust?q=files-only

Creates a directory and any necessary parent directories if they do not exist.

```rust
use std::fs::create_dir_all;
create_dir_all("path");
```

--------------------------------

### Create a new HashSet

Source: https://speedsheet.io/s/rust?q=hashset-only

Creates an empty `HashSet`. Use this when you need to start with a fresh set.

```Rust
use std::collections::HashSet;

let set_1: HashSet<T> = HashSet::new();
```

--------------------------------

### Check if String Starts With Substring

Source: https://speedsheet.io/s/rust?q=string-only

Returns true if the string starts with the specified substring.

```Rust
let string_1 = String::from("hello world");
let starts_with_hello = string_1.starts_with("hello"); // true
```

--------------------------------

### Compile and Run Test Executable

Source: https://speedsheet.io/s/rust?q=command-line-only

First compiles all tests into a binary using `rustc --test`, then runs the resulting executable.

```bash
rustc --test program_name.rs
program_name
```

--------------------------------

### Check if String Starts With Another

Source: https://speedsheet.io/s/rust?q=str-only

Returns true if the string starts with or equals another string.

```Rust
str_1.starts_with(str_2)
```

--------------------------------

### Implicit Return Value Example

Source: https://speedsheet.io/s/rust

Demonstrates implicit return where the last expression is the return value.

```rust
fn square(x: i32) -> i32 { x * x }
fn main() {
    let value = 4;
    let square = square(value);
    println!("{} squared is {}.
", value, square);
}
```

--------------------------------

### Get HashMap Properties

Source: https://speedsheet.io/s/rust?q=hashmap

Illustrates how to get the current length (number of elements) and check if the HashMap is empty.

```rust
let length = map.len());
let is_empty = map.is_empty());
```

--------------------------------

### Show Rustup Configuration

Source: https://speedsheet.io/s/rust?q=command-line-only

Displays the current rustup configuration, including available targets, the default target, and the active toolchains.

```bash
rustup show
```

--------------------------------

### Generate and Open Project Documentation

Source: https://speedsheet.io/s/rust?q=command-line-only

Generates HTML documentation for the project and automatically opens it in the default web browser.

```rust
cargo doc --open
```

--------------------------------

### Valid Identifier Examples

Source: https://speedsheet.io/s/rust?q=fundamentals-only

Provides examples of valid identifiers according to Rust's naming rules.

```Rust
_identifier identifier 식별자 item_1
```

--------------------------------

### Create Directory

Source: https://speedsheet.io/s/rust?q=files-only

Creates a new, empty directory at the specified path. Ensure the parent directories exist.

```rust
use std::fs::create_dir;
create_dir("path");
```

--------------------------------

### Implementing the Into Trait

Source: https://speedsheet.io/s/rust?q=into-only+trait

Example of how to implement the Into trait for custom type conversions. Requires type annotations or turbofish.

```rust
impl Into<ToType> for FromType { fn into(self) -> ToType { ... } }
```

--------------------------------

### Get the length of a Vec

Source: https://speedsheet.io/s/rust?q=%3A%3Avec

Use `len()` to get the number of elements currently in the vector. This returns a `usize` value.

```Rust
let vec_1 = vec!["a", "b", "c"]; println!("Size {}.", vec_1.len()); // Prints: "Size 3."
```

--------------------------------

### Login and Publish Crate

Source: https://speedsheet.io/s/rust?q=command-line-only

Logs into a crate registry using an authentication token and publishes a crate.

```bash
cargo login repository_authentication_token
cargo publish
```

--------------------------------

### Get the Length of a BTreeMap

Source: https://speedsheet.io/s/rust?q=btreemap-only

Use `len` to get the number of elements currently stored in the BTreeMap. This is an O(1) operation.

```rust
btree_map_1.len()
```

--------------------------------

### Initialize New Rust Project in Current Directory

Source: https://speedsheet.io/s/rust?q=command-line-only

Initializes a new Rust project in the current directory, creating necessary files like Cargo.toml and a src/ directory.

```rust
cargo init
```

--------------------------------

### Basic Usage of format! Macro

Source: https://speedsheet.io/s/rust?q=format%21-only

Demonstrates the simplest usage of the format! macro to create a string literal.

```rust
format!("Print this.");
```

--------------------------------

### Async Redis Client with Tokio

Source: https://speedsheet.io/s/rust_tools

An example of using the tokio runtime to create an asynchronous Redis client, set a key-value pair, and retrieve it. Ensure tokio and mini-redis crates are added to your Cargo.toml.

```Rust
use mini_redis::{client, Result as redis_Result};
#[tokio::main]
async fn main() -> redis_Result<()> {
    println!("in tokio");
    let mut client = client::connect("127.0.0.1:6379").await?;
    client.set("hello", "world".into()).await?;
    let result = client.get("hello").await?;
    println!("got value result={:?}", result);
    Ok(())
}
```

--------------------------------

### Filesystem Utilities with fs2

Source: https://speedsheet.io/s/rust_tools

Demonstrates file locking, allocation, and retrieving allocated file size using the fs2 crate. Requires `use fs2::FileExt;`.

```Rust
use fs2::FileExt;
use std::fs::File;

let file_1 = File::open("foo.txt")?;
// File is locked until dropped or unlock() called:
file_1.lock_exclusive()?;
// Allocate 1KB of space:
file_1.allocate(1024)?;
// Free space:
// Returns allocated bytes
file_1.allocated_size()?;
```

--------------------------------

### Get HashMap Value by Key

Source: https://speedsheet.io/s/rust?q=hashmap

Use `get(key)` to retrieve an `Option` containing a reference to the value associated with the given key.

```Rust
let value = hashmap_1.get(key);
```

--------------------------------

### Build Publishable Crate

Source: https://speedsheet.io/s/rust?q=command-line-only

Creates a publishable crate. The output is placed in the target/package directory.

```bash
cargo package
```

--------------------------------

### Get the last item from Vec

Source: https://speedsheet.io/s/rust?q=%3A%3Avec

Use `last()` to get an `Option<&T>` reference to the last element. Returns `None` if the vector is empty.

```Rust
vec_1.last();
```

--------------------------------

### Path::new

Source: https://speedsheet.io/s/rust

Creates a new Path instance from a given string slice. This is the primary way to start working with paths.

```APIDOC
## Path - Create

= Path::new(path)

### Description
Creates an instance of Path from a string slice.

### Usage
```rust
use std::path::Path;

let path = Path::new("some/path/string");
```

### Returns
`std::path::Path`
```

--------------------------------

### Generate Project Documentation

Source: https://speedsheet.io/s/rust?q=command-line-only

Generates HTML documentation for the project and its dependencies.

```rust
cargo doc
```

--------------------------------

### Get the first item from Vec

Source: https://speedsheet.io/s/rust?q=%3A%3Avec

Use `first()` to get an `Option<&T>` reference to the first element. Returns `None` if the vector is empty.

```Rust
vec_1.first();
```

--------------------------------

### Get Immutable Value from BTreeMap

Source: https://speedsheet.io/s/rust?q=btreemap-only

Use `get` to retrieve an immutable reference to the value associated with a key. Returns `Option<&Value>`.

```rust
btree_map_1.get(key)
```

--------------------------------

### Get Value from OnceLock

Source: https://speedsheet.io/s/rust?q=OnceLock

Use `get()` to retrieve an optional reference to the value stored in the OnceLock. Returns `None` if the value has not been initialized.

```rust
let value: OnceLock<i32> = OnceLock::new();

// Initially, get() returns None
assert!(value.get().is_none());
```

--------------------------------

### Generate Project Documentation (No Dependencies)

Source: https://speedsheet.io/s/rust?q=command-line-only

Generates HTML documentation for the project only, excluding dependencies.

```rust
cargo doc --no-deps
```

--------------------------------

### Array Slicing Examples in Rust

Source: https://speedsheet.io/s/rust?q=array-only

Demonstrates various ways to create slices from an array, including inclusive and exclusive end points, and slicing to the end or from the beginning.

```rust
let array_1 = [1, 2, 3, 4, 5];
let first = &array_1[0..=0]; // [1]
let last = &array_1[array_1.len() - 1.. array_1.len()]; // [5]
let index_1 = &array_1[1..=1]; // [2]
let index_1_to_3 = &array_1[1..4]; // [2, 3, 4]
let index_1_to_end = &array_1[1..]; // [2, 3, 4, 5]
let start_to_index_3 = &array_1[..4]; // [1, 2, 3, 4]
```

--------------------------------

### Rust Test Function Example

Source: https://speedsheet.io/s/rust?q=assert%21-only

An example of how to use the assert! macro within a Rust test function. This pattern is common for unit testing.

```rust
#[test]
fn assert_test() {
  assert!(expression);
}
```

--------------------------------

### Create HashMap with Initial Values

Source: https://speedsheet.io/s/rust

Creates a HashMap and populates it with initial key-value pairs using `insert`.

```rust
use std::collections::HashMap;
let mut hashmap_1 = HashMap::new();
hashmap_1.insert("one", "Value 1");
hashmap_1.insert("two", "Value 2");
let value = &hashmap_1.get(&"one");
println!("{}", value.unwrap()); // Prints: "Value 1"
```

--------------------------------

### Rust Integer Range with Step

Source: https://speedsheet.io/s/rust?q=range-only

Shows how to create an integer range that increments by a specified step size using `.step_by()`.

```rust
use std::ops::Range;
let range_1: Range<i32> = (0..=10).step_by(2);
```

--------------------------------

### Use Root Module File

Source: https://speedsheet.io/s/rust

Demonstrates how to use a function from a root module defined as a single file. Requires a `use` statement to bring the function into scope.

```rust
src/ 
├── main.rs 
│ │ use module_name::do_something;
│ │ 
│ do_something();
│ 
└── some_module.rs
use crate::module_name::do_something;
do_something();
```

--------------------------------

### Get Duration in Microseconds in Rust

Source: https://speedsheet.io/s/rust?q=duration-only

Use the .as_micros() method on a Duration object to get its value in microseconds as a u128. This is useful for precise time measurements.

```rust
let duration_1 = std::time::Duration::from_secs(1);
let microseconds = duration_1.as_micros();
```

--------------------------------

### Create a Path Instance

Source: https://speedsheet.io/s/rust

Creates a new `Path` instance from a string slice. This is the fundamental way to represent a file system path.

```rust
use std::path::Path;

let path = Path::new("path");
```

--------------------------------

### Get an item from Vec by index (Panic)

Source: https://speedsheet.io/s/rust?q=%3A%3Avec

Use direct indexing `vec_1[index]` to access an item. This is faster than `get()` but will panic if the index is out of bounds.

```Rust
vec_1[index];
```

--------------------------------

### Hello World with User Input in Rust

Source: https://speedsheet.io/s/rust?q=hello+world

This snippet demonstrates reading a line of text from standard input and then printing a personalized greeting. It includes basic error handling for the input operation and removes the trailing newline character from the input.

```rust
use std::io::stdin;

fn main() {
    let mut name = String::new();
    println!("name: ");
    if let Err(error) = stdin().read_line(&mut name) {
        eprintln!("Error: {}", error);
        return;
    }
    name.pop(); // Remove the newline character.
    println!("Hello, {}!", name);
}
```

--------------------------------

### Extract Right Slice from Array in Rust

Source: https://speedsheet.io/s/rust?q=array-only

Returns a slice containing elements from a specified start index to the end of the array. The start index is inclusive.

```rust
let array_1 = [1, 2, 3, 4, 5];
let subarray = &array_1[2..];
println!("{:?}", &subarray); // Prints: [3, 4, 5]
```

--------------------------------

### Generate Project Documentation (Include Private Items)

Source: https://speedsheet.io/s/rust?q=command-line-only

Generates HTML documentation including private items.

```rust
cargo doc --document-private-items
```

--------------------------------

### Get OS Information

Source: https://speedsheet.io/s/rust_tools

Retrieve detailed operating system information using the os_info crate. This includes OS type, version, edition, and architecture.

```rust
use os_info::get;

fn main() {
    let info = get();
    println!("OS Type: {}", info.os_type());
    println!("Version: {}", info.version());
    println!("Edition: {:?}", info.edition());
    println!("Codename: {:?}", info.codename());
    println!("Bitness: {}", info.bitness());
    println!("Architecture: {:?}", info.architecture());
    println!("Formatted: {}", info);
}
```

--------------------------------

### Get Mutable Iterator with .iter_mut()

Source: https://speedsheet.io/s/rust

Use `.iter_mut()` to get a mutable iterator over the Result. If Ok, it yields one mutable reference. If Err, it yields no items.

```rust
= result_1.iter_mut()
```

--------------------------------

### HashMap - Basic Operations

Source: https://speedsheet.io/s/rust?q=hashmap-only

Demonstrates basic HashMap operations: creation, insertion, access, update, iteration, removal, checking for existence, and clearing. Requires `Eq + Hash` traits for keys.

```Rust
use std::collections::HashMap;

// Create and insert
let mut map_1 = HashMap::new();
map_1.insert("a", 1);
map_1.insert("b", 2);
map_1.insert("c", 3);

// Access
let value = map_1.get("b");
match value {
    Some(value) => println!("Value for 'b': {}", value),
    None => println!("Key 'b' not found"),
}

// Update
map_1.insert("b", 22);

// Iterate
for (key, value) in &map_1 {
    println!("{}: {}", key, value);
}

// Remove
map_1.remove("a");

// Exists
let exists = map_1.contains_key("c");

// Properties
let length = map_1.len();
let is_empty = map_1.is_empty();

// Clear
map_1.clear();
```

--------------------------------

### Get Current Local Time with Chrono

Source: https://speedsheet.io/s/rust_tools

Demonstrates how to get the current local date and time using the Chrono crate. Ensure Chrono is added to your Cargo.toml.

```rust
use chrono::prelude::{DateTime, Local};
let _local: DateTime<Local> = Local::now(); // =~ `2014-11-28T21:45:59.324310806+09:00`
```

--------------------------------

### Create String with Value

Source: https://speedsheet.io/s/rust

Creates a string with an initial value. All three ways shown are equivalent. The data lives on the heap.

```Rust
"a string".to_string()
```

```Rust
String::from("a string")
```

```Rust
let string_1: String = String::from("a string");
```

--------------------------------

### Basic Hello World in Rust

Source: https://speedsheet.io/s/rust?q=hello+world

The most fundamental 'Hello, World!' program in Rust. It prints a static string to the console.

```rust
fn main() { println!("Hello world!"); }
```

--------------------------------

### Get Duration in Seconds in Rust

Source: https://speedsheet.io/s/rust?q=duration-only

Use the .as_secs() method on a Duration object to get its value in whole seconds as a u64. This is useful for general time calculations.

```rust
let duration_1 = std::time::Duration::from_secs(60);
let seconds = duration_1.as_secs();
```

--------------------------------

### Slicing Vec from Start to Inclusive End in Rust

Source: https://speedsheet.io/s/rust?q=std%3A%3Avec%3A%3Avec

Creates a new Vec containing elements within a specified range, including both the start and end indices.

```rust
let from_to: Vec<_> = vec_1[start..=end].to_vec();
```

--------------------------------

### Create New Rust Application

Source: https://speedsheet.io/s/rust?q=command-line-only

Creates a new Rust project with a standard directory structure, including source files, Cargo.toml, and Git configuration.

```rust
cargo new application_name
```

--------------------------------

### Generate Project Documentation

Source: https://speedsheet.io/s/rust

Generates HTML documentation for the project and its dependencies. Use `--no-deps` to show only project docs, or `--document-private-items` to include private items.

```bash
cargo doc
```

```bash
cargo doc --no-deps
```

```bash
cargo doc --document-private-items
```

--------------------------------

### Rust Documentation Comment

Source: https://speedsheet.io/s/rust?q=Comments+Multiline

Use documentation comments (///) to generate API documentation. Each line starts with '///' and precedes the item being documented.

```rust
/// This is a doc comment.
/// This doc comment /// adds content to the /// following function. fn documented_function() { ... }
```

--------------------------------

### Generate Documentation (Alternative)

Source: https://speedsheet.io/s/rust?q=command-line-only

Converts Rust code doc comments into HTML documentation. This command bypasses dependency checks before generation.

```rust
cargo rustdoc
```

--------------------------------

### Get an item from Vec by index (Option)

Source: https://speedsheet.io/s/rust?q=%3A%3Avec

Use `get(index)` to safely retrieve an item by its index. It returns `Some(&T)` if the index is valid, and `None` if out of bounds. This is slower than direct indexing.

```Rust
vec_1.get(index);
```

--------------------------------

### Show Crate Dependency Tree

Source: https://speedsheet.io/s/rust?q=command-line-only

Shows the specified crate and its version number within the project's dependency tree.

```bash
cargo tree -i crate_name
```

--------------------------------

### Create New Rust Library

Source: https://speedsheet.io/s/rust?q=command-line-only

Creates a new Rust library project with a standard structure, including a lib.rs file.

```rust
cargo new --lib library_name
```

--------------------------------

### Get Mutable Reference from Arc<Mutex<T>>

Source: https://speedsheet.io/s/rust?q=arc%2Bmutex

Use `arc_1.get_mut()` to attempt to get a mutable reference to the inner value. This method is only available when the `Arc` is the sole owner of the inner `Mutex`.

```rust
let mut arc_1 = Arc::new(Mutex::new(5));
// Assuming arc_1 is the only strong reference to the Mutex
let mutable_ref_option = arc_1.get_mut();
```

--------------------------------

### Create Path with New Extension

Source: https://speedsheet.io/s/rust

Returns a new path with the file extension replaced or added. The '.' is automatically prepended if needed.

```rust
use std::path::Path;

let path_1 = Path::new("some/file.old");
let new_path = path_1.with_extension("new"); // Returns PathBuf for "some/file.new"
```

--------------------------------

### Get or Initialize Value in OnceLock

Source: https://speedsheet.io/s/rust?q=OnceLock

Use `get_or_init()` to get the contained value or initialize it using a closure if it's not already set. This method is thread-safe and ensures the closure is called at most once.

```rust
use std::cell::OnceLock;

let value: OnceLock<String> = OnceLock::new();

let initialized_value = value.get_or_init(|| {
    println!("Initializing...");
    "Hello, OnceLock!".to_string()
});

assert_eq!(*initialized_value, "Hello, OnceLock!");

// Subsequent calls will return the existing value without re-initializing
let same_value = value.get_or_init(|| {
    panic!("This should not be called again!");
});

assert_eq!(*same_value, "Hello, OnceLock!");
```

--------------------------------

### Append to PathBuf

Source: https://speedsheet.io/s/rust

Joins a directory and subdirectory using the system file separator. Returns a new PathBuf. This example demonstrates creating a path and appending components to it.

```Rust
use std::path::PathBuf;
use std::path::MAIN_SEPARATOR_STR;

let mut pathbuf_1 = PathBuf::new();
pathbuf_1.push(MAIN_SEPARATOR_STR);
pathbuf_1.push("home");
pathbuf_1.push("your_name_here");

println!("{}", pathbuf_1.display()); // Prints: /home/your_name_here
```

--------------------------------

### Slicing Vec from Start to Exclusive End in Rust

Source: https://speedsheet.io/s/rust?q=std%3A%3Avec%3A%3Avec

Creates a new Vec containing elements within a specified range, including the start index but excluding the end index.

```rust
let from_to: Vec<_> = vec_1[start..end_plus_1].to_vec();
```

--------------------------------

### Async HTTP GET Request with Reqwest

Source: https://speedsheet.io/s/rust_tools

Demonstrates how to perform an asynchronous GET request and parse the JSON response using the reqwest crate. Ensure the reqwest crate is added to your Cargo.toml.

```Rust
use std::collections::HashMap;
async fn get_ip() -> Result<()> {
    let resp = reqwest::get("https://httpbin.org/ip")
        .await?
        .json::<HashMap<String, String>>()
        .await?;
    println!("{:#?}", resp);
    Ok(())
}
```

--------------------------------

### Call a Closure

Source: https://speedsheet.io/s/rust

Provides examples of how to invoke a closure, passing any required arguments. Closures can be called using standard function call syntax.

```rust
closure_1(params)
```

```rust
(closure_1)(params)
```

--------------------------------

### Get Array Element by Index (Option)

Source: https://speedsheet.io/s/rust?q=array-only

Safely retrieve an element from an array using its index with the `get` method. It returns an `Option<T>`, providing `None` if the index is out of bounds. This method is slower than direct indexing.

```rust
let array_1 = [1, 2, 3];
second = array_1.get(1);
```

--------------------------------

### Creating Option Instances

Source: https://speedsheet.io/s/rust?q=option-only

Demonstrates how to create instances of the Option enum, including a Some variant with a value and a None variant. When creating a None variant, the type must be explicitly defined.

```Rust
let item_1 = Some(value_1);
let item_2 = None;
```

--------------------------------

### Get File Length in Rust

Source: https://speedsheet.io/s/rust?q=files-only

After obtaining file metadata using `std::fs::metadata()`, you can get the file's length in bytes by calling the `len()` method on the `Metadata` object. This returns a `u64` value.

```Rust
use std::fs;

fn main() -> std::io::Result<()> {
    let metadata = fs::metadata("path")?;
    let len = metadata.len();
    println!("File length: {} bytes", len);
    Ok(())
}
```

--------------------------------

### Install Bacon background code checker

Source: https://speedsheet.io/s/rust_tools

Install the Bacon tool, a background Rust code checker that integrates with IDEs to display standard Rust errors as you code. It can run various cargo commands like build, test, and docs.

```bash
cargo install --locked bacon
```

--------------------------------

### Import All from Parent Module

Source: https://speedsheet.io/s/rust?q=tests-only

Use `use super::*;` within a test module to import all items from the parent module.

```rust
use super::*;
```

--------------------------------

### Add Regex Crate to Project

Source: https://speedsheet.io/s/rust_regex

Install the regex crate using Cargo. This is the first step to using regex functionality in your Rust project.

```bash
cargo add regex
```

--------------------------------

### PathBuf - Parent

Source: https://speedsheet.io/s/rust

Gets the parent directory of the pathbuf.

```APIDOC
## PathBuf - Parent

### Description
Gets the parent directory for the pathbuf.

### Returns
Option<&OsStr>

### Example
```rust
use std::path::PathBuf;
let pathbuf_1 = PathBuf::from("/user/your_name_here/file.txt");
if let Some(parent) = pathbuf_1.parent() {
    println!("Parent directory: {}", parent.to_string_lossy());
}
// Prints: Parent directory: /user/your_name_here
```
```

--------------------------------

### Basic write! Macro Usage

Source: https://speedsheet.io/s/rust?q=write-only

Demonstrates the basic usage of the write! macro to print a string to a writer. The writer must implement the std::io::Write trait.

```rust
use std::io::{Write, Result};

fn main() -> Result<()> {
    let mut buffer = Vec::new();
    write!(&mut buffer, "Hello, world!")?;
    println!("Buffer content: {:?}", buffer);
    Ok(())
}
```

--------------------------------

### File - Get Metadata

Source: https://speedsheet.io/s/rust?q=files-only

Retrieves the metadata for a file.

```APIDOC
## File - Get Metadata

### Description
Returns the metadata for a file.

### Method
`metadata(path)`

### Parameters
#### Path Parameters
- **path** (string) - Required - The path to the file.

### Returns
- **Result<Metadata>** - A Result containing the file's metadata, or an error if it cannot be retrieved.

### Example
```rust
use std::fs::metadata;
let file_metadata = metadata("path/to/your/file");
```
```

--------------------------------

### HashMap Get

Source: https://speedsheet.io/s/rust

Retrieves the value associated with the given key.

```APIDOC
## HashMap - Get

### Description
Returns the value for the given key.

### Method
`get`

### Endpoint
`hashmap_1.get(key)`

### Returns
`Option<&Value>`
```

--------------------------------

### PathBuf - File Extension

Source: https://speedsheet.io/s/rust

Gets the file extension of the pathbuf.

```APIDOC
## PathBuf - File Extension

### Description
Gets the file extension of the pathbuf. Returns `None` if no extension is found.

### Returns
Option<&OsStr>

### Example
```rust
use std::path::PathBuf;
let pathbuf_1 = PathBuf::from("/user/your_name_here/file.txt");
if let Some(extension) = pathbuf_1.extension() {
    println!("File extension: {:?}", extension);
}
// Prints: File extension: "txt"
```
```

--------------------------------

### Get User Audio Directory with Dirs

Source: https://speedsheet.io/s/rust_tools

Retrieves the user's audio directory path. The output varies by operating system.

```Rust
dirs::audio_dir(); // Lin: Some(/home/alice/Music)
// Win: Some(C:\Users\Alice\Music)
// Mac: Some(/Users/Alice/Music)
```

--------------------------------

### Initialize u64 with Literal

Source: https://speedsheet.io/s/rust

Demonstrates initializing a 64-bit unsigned integer using a literal with a type suffix.

```rust
let int_1 = 42_u64;
println!("{}", int_1); // Prints: "42"
```

--------------------------------

### write! Macro with Variables

Source: https://speedsheet.io/s/rust?q=write-only

Shows how to use the write! macro to include variables in the output. The variables are formatted according to the format specifiers.

```rust
use std::io::{Write, Result};

fn main() -> Result<()> {
    let name = "Alice";
    let age = 30;
    let mut buffer = Vec::new();
    write!(&mut buffer, "Name: {}, Age: {}", name, age)?;
    println!("Buffer content: {:?}", buffer);
    Ok(())
}
```

--------------------------------

### PathBuf - File Name

Source: https://speedsheet.io/s/rust

Gets the file name portion of the pathbuf.

```APIDOC
## PathBuf - File Name

### Description
Gets the file name portion of the pathbuf (file name and extension, but no directory).

### Returns
Option<&OsStr>

### Example
```rust
use std::path::PathBuf;
let path_1 = PathBuf::from("/user/your_name_here/file.txt");
if let Some(file_name) = path_1.file_name() {
    println!("File name: {:?}", file_name);
}
// Prints: File name: "file.txt"
```
```

--------------------------------

### Get String Capacity

Source: https://speedsheet.io/s/rust?q=string-only

Returns the current capacity of the string in bytes.

```Rust
let string_1 = String::from("hello");
let capacity = string_1.capacity(); // usize
```

--------------------------------

### Import All Public Items

Source: https://speedsheet.io/s/rust?q=symbols-only

The `:: *` syntax is used in `use` declarations to import all public items from a specific module.

```rust
used library::module::*
```

--------------------------------

### File - Get Created Date

Source: https://speedsheet.io/s/rust?q=files-only

Retrieves the creation date of a file.

```APIDOC
## File - Get Created Date

### Description
Returns the creation system time for a file.

### Method
`metadata.created()`

### Parameters
#### Path Parameters
- **metadata** (Metadata) - Required - The metadata object obtained from `std::fs::metadata()`.

### Returns
- **Result<SystemTime>** - A Result containing the creation system time, or an error.

### Example
```rust
use std::fs::metadata;
let metadata = metadata("path/to/your/file")?;
let created_time = metadata.created();
```
```

--------------------------------

### Create and Insert into HashMap

Source: https://speedsheet.io/s/rust?q=hashmap

Demonstrates the basic creation of a mutable HashMap and inserting key-value pairs.

```rust
let mut map_1 = HashMap::new();
map_1.insert("a", 1);
map_1.insert("b", 2);
map_1.insert("c", 3);
```

--------------------------------

### Get Match Length

Source: https://speedsheet.io/s/rust_regex?q=match-only

Returns the number of characters in the matched text.

```rust
match_1.len()
```
Tokens:
Raw