### Install Pipeable JavaScript (pjs) CLI Tool

Source: https://github.com/danielstjules/pjs/blob/master/README.md

Provides the command to globally install the `pipeable-js` CLI tool using npm, making it available for use in the terminal.

```Bash
npm install -g pipeable-js
```

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

### Reduce Lines with pjs

Source: https://github.com/danielstjules/pjs/blob/master/README.md

Examples demonstrating the `-r` (reduce) option in `pjs` for aggregating data. It shows how to count lines, sum numbers, and concatenate lines using both built-in reduce functions and custom expressions.

```Bash
# Count lines in file
# wc -l file
# awk 'END { print NR }' file
pjs -r length file

# Sum all decimal numbers in a file
# awk '{ sum += $1 } END { print sum }' file
# perl -nle '$sum += $_ } END { print $sum' file
pjs -r 'Number(prev) + Number(curr)' file
pjs -r '(+prev) + (+curr)' file
pjs -r sum file

# Concatenate all lines in multiple files
# awk '{printf $0;}' file1 file2
# cat file1 file2 | tr -d '\n'
pjs -r concat file1 file2
```

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

### Apply Ramda Functions in pjs Expressions

Source: https://github.com/danielstjules/pjs/blob/master/README.md

Demonstrates how to use Ramda functions, accessible via the `R` object, within `pjs` expressions. This example showcases a point-free style for string manipulation.

```Bash
echo 'please-titleize-this-sentence' | \
pjs -m "R.compose(R.replace(/(^|\s)\w/g, R.toUpper), R.replace(/-/g, ' '))"
# Please Titleize This Sentence
```

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

### Map Lines with pjs

Source: https://github.com/danielstjules/pjs/blob/master/README.md

Examples illustrating the use of the `-m` (map) option in `pjs` to transform lines. It covers removing digits from lines and extracting specific fields from CSV formatted lines.

```Bash
# Remove all digits
# tr -d 0-9 < file
pjs -m "replace(/\d/g, '')" file

# Get second item of each line in csv
# awk -F "," '{print $2}' file
pjs -m 'split(",")[1]' file
```

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

### Filter Lines with pjs

Source: https://github.com/danielstjules/pjs/blob/master/README.md

Examples demonstrating how to use the `-f` (filter) option in `pjs` to select lines based on conditions. It shows filtering by line index (odd lines) and by line length.

```Bash
# Print all odd lines
# awk 'NR % 2 == 1' file
pjs -f 'i % 2 == 0' file

# Print all lines greater than 80 chars in length
# awk 'length($0) > 80' file
pjs -f 'length > 80' file
```

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

### Combine Map and Reduce Operations with pjs

Source: https://github.com/danielstjules/pjs/blob/master/README.md

An example showing how to combine map and reduce operations in `pjs` to find the length of the longest line in a file. It first maps each line to its length, then reduces the resulting lengths to find the maximum.

```Bash
# Print the length of the longest line
# awk '{ if (length($0) > max) max = length($0) } END { print max }' file
pjs -m 'length' -r max file
```

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

### pjs Command Line Interface (CLI) Options

Source: https://github.com/danielstjules/pjs/blob/master/README.md

Documents the command-line options and arguments for the `pjs` tool. It details how functions and expressions are applied, available built-in reduce functions, and support for Lodash and Ramda.

```APIDOC
Usage: pjs [options] [files ...]

Functions and expressions are invoked in the following order:
filter, map, reduce

All functions are passed the line ($) and index (i)
Built-in reduce functions: length, min, max, sum, avg, concat
Custom reduce expressions accept: prev, curr, i, array
Includes lodash (_), and can be chained using $$
Supports Ramda (R) and point-free style

Options:

  -h, --help               output usage information
  -V, --version            output the version number
  -i, --ignore             ignore empty lines
  -j, --json               output as json
  -f, --filter <exp>       filter by a boolean expression
  -m, --map <exp>          map values using the expression
  -r, --reduce <func|exp>  reduce using a function or expression
```

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

### Filter and Map Text Streams with pjs

Source: https://github.com/danielstjules/pjs/blob/master/README.md

Demonstrates basic `pjs` usage for filtering lines by length, mapping lines to their length or uppercased versions, and combining filter/map operations. It highlights how `pjs` binds string methods directly to the current line.

```Bash
# Return all lines longer than 5 chars
# => lines.filter(function(line) { return line.length > 5; });
ls -1 | pjs -f 'length > 5'

# Count characters in each line
# => lines.map(function(line) { return line.length; });
ls -1 | pjs -m 'length'

# Uppercase and pad each line
# => lines.map(function(line) { return '  ' + line.toUpperCase()"; });
ls -1 | pjs -m '"  " + toUpperCase()'

# Return lines longer than 5 chars, and remove any digits
# => lines
#      .filter(function(line) { return line.length > 5; })
#      .map(function(line) { return line.replace(/\d/g, ''); });
ls -1 | pjs -f 'length > 5' -m 'replace(/\d/g, "")'
```

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

### Generate JSON Output with pjs

Source: https://github.com/danielstjules/pjs/blob/master/README.md

Illustrates how to use `pjs` to transform input lines into JSON objects. The `$` variable represents the current line, allowing for dynamic object creation.

```Bash
(echo 'foo' && echo 'foobar') | pjs -jm '{name: $, length: length}'
```

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

### Integrate Lodash Functions in pjs Expressions

Source: https://github.com/danielstjules/pjs/blob/master/README.md

Shows how `pjs` provides access to Lodash functions via the `_` object. It also demonstrates chaining operations using the `$$` variable for more complex transformations.

```Bash
echo 'hello' | pjs -m '_.upperFirst($)'
# Hello

echo 'please-titleize-this-sentence' | \
pjs -m '$$.lowerCase().split(" ").map(_.upperFirst).join(" ")'
# Please Titleize This Sentence
```

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