jacobaweiss / reduce_ranges

Reduces consecutive elements of an array of integers into ranges.

ReduceRanges

Reduce consecutive integers in an array into ranges.

Installation

Add this line to your application's Gemfile:

gem 'reduce_ranges'

And then execute:

$ bundle

Or install it yourself as:

$ gem install reduce_ranges

Usage

ReduceRanges adds an extension to the Array object. To use it, call #reduce_ranges on an array of integers:

[-3, -2, -1, 1, 3, 4, 5].reduce_ranges #=> [-3..-1, 1, 3..5]

Note that this only works on arrays of integers. If you call it on an array with any other kind of element, it will raise an error:

%w(what it do).reduce_ranges #=> TypeError
[1.0, 2.0, 3.0].reduce_ranges #=> TypeError
# etc..

Shout outs to @calyhre for the current implementation and @lkdjiin for his blog posts on the subject!i

Contributing

1. Fork it ( https://github.com/jacobaweiss/reduce_ranges/fork )
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 a new Pull Request