### Open XLSX from Memory (Binary)

Source: https://github.com/xavier/xlsx_reader/blob/master/README.md

Illustrates how to load XLSX data directly from a binary string in memory using `XlsxReader.open` with the `:source` option set to `:binary`.

```elixir
blob = File.read!("test.xlsx")

{:ok, package} = XlsxReader.open(blob, source: :binary)
```

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

### Open XLSX File from File System

Source: https://github.com/xavier/xlsx_reader/blob/master/README.md

Demonstrates opening an XLSX file located on the file system using `XlsxReader.open`. It then shows how to retrieve the names of all sheets within the package and load data from a specific sheet.

```elixir
{:ok, package} = XlsxReader.open("test.xlsx")

XlsxReader.sheet_names(package)
# ["Sheet 1", "Sheet 2", "Sheet 3"]

{:ok, rows} = XlsxReader.sheet(package, "Sheet 1")
# [
#   ["Date", "Temperature"],
#   [~D[2019-11-01], 8.4],
#   [~D[2019-11-02], 7.5],
#   ...
# ]
```

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

### Add XlsxReader Dependency to mix.exs

Source: https://github.com/xavier/xlsx_reader/blob/master/README.md

Shows how to add the XlsxReader library as a dependency in an Elixir project's `mix.exs` file. This is the first step to using the library.

```elixir
def deps do
  [
    {:xlsx_reader, ">~ 0.8.0"}
  ]
end
```

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

### Load All Sheets at Once

Source: https://github.com/xavier/xlsx_reader/blob/master/README.md

Shows how to load all sheets from an XLSX package into a list of tuples, where each tuple contains the sheet name and its row data.

```elixir
{:ok, sheets} = XlsxReader.sheets(package)
# [
#   {"Sheet 1", [["Date", "Temperature"], ...]},
#   {"Sheet 2", [...]},
#   ...
# ]
```

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

### Load All Sheets Concurrently

Source: https://github.com/xavier/xlsx_reader/blob/master/README.md

Explains how to load all sheets from an XLSX package concurrently using `XlsxReader.async_sheets`, which can improve performance for files with many sheets.

```elixir
{:ok, sheets} = XlsxReader.async_sheets(package)
# [
#   {"Sheet 1", [["Date", "Temperature"], ...]},
#   {"Sheet 2", [...]},
#   ...
# ]
```

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

### Access Cell Formulas and Data

Source: https://github.com/xavier/xlsx_reader/blob/master/README.md

Demonstrates how to retrieve detailed cell data, including formulas and references, by setting `cell_data_format: :cell` when loading a sheet.

```elixir
{:ok, rows} = XlsxReader.sheet(package, "Sheet 1", cell_data_format: :cell)
# [
#   [%Cell{value: 1234.0, formula: "SUM(B1, B10)", ref: "A1"}, ...],
#   ...
# ]
```

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

### Load Sheets Selectively

Source: https://github.com/xavier/xlsx_reader/blob/master/README.md

Demonstrates loading specific sheets from an XLSX package by providing a list of sheet names or regular expressions to the `only` option, and excluding others with the `except` option.

```elixir
{:ok, sheets} = XlsxReader.sheets(package, only: ["Parameters", ~r/Sheet \d+/], except: ["Sheet 2"])
# [
#   {"Parameters", [...]},
#   {"Sheet 1", [...]},
#   {"Sheet 3", [...]},
#   {"Sheet 4", [...]},
#   ...
# ]
```

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

### Use Arbitrary Precision Numbers

Source: https://github.com/xavier/xlsx_reader/blob/master/README.md

Shows how to configure XlsxReader to parse numbers as arbitrary precision `Decimal` types by passing `number_type: Decimal` to the `XlsxReader.sheet` function.

```elixir
{:ok, rows} = XlsxReader.sheet(package, "Sheet 1", number_type: Decimal)
# [
#   ["Date", "Temperature"],
#   [~D[2019-11-01], %Decimal{coef: 84, exp: -1, sign: 1}],
#   [~D[2019-11-02], %Decimal{coef: 75, exp: -1, sign: 1}],
#   ...
# ]
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.