Crosscounter

A set of functional tools for generating cross tabulations.

Installation

Add this line to your application's Gemfile:

gem 'crosscounter'

Usage

Crosscounter works entirely with standard data structures, i.e. arrays and hashes. General usage is to provide an enumerable containing hashes of values, followed by a rows hash and a columns hash.

enumerable = [
  { age: 18, gender: 'male',   tags: %w[happy sad] },
  { age: 19, gender: 'female', tags: %w[happy mad] },
  { age: 18, gender: 'male',   tags: %w[mad sad] },
  { age: 19, gender: 'male',   tags: %w[sad] }
]

rows = {
  age: [18, 19],
  gender: %w[male female],
  tags: %w[happy sad mad]
}

cols = { tags: %w[happy sad mad] }

computer.compute_all(enumerable, rows, cols) #=> [
  [18,       2, 1, 2, 1],
  [19,       2, 1, 1, 1],
  ['male',   3, 1, 3, 1],
  ['female', 1, 1, 0, 1],
  ['happy',  2, 2, 1, 1],
  ['sad',    3, 1, 3, 1],
  ['mad',    2, 1, 1, 2]
]

The resulting output is an array of arrays mapping out every row value against every column value. In the example above the columns are:

key	all	tags['happy']	tags['sad']	tags['mad']
18	2	1	2	1

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request