Canal

Build functions out of methods.

Examples

Canal can allow point-free expressions. For example, when using map:

%w{10010101 11100 10110}.map(&canal.to_i(2).to_s.reverse.to_i.to_s(2))

is equivalent to

%w{10010101 11100 10110}.map do |x|
  x.to_i(2).to_s.reverse.to_i.to_s(2)
end

An empty canal is the identity function.

[1, 2, 3].map(&canal)
=> [1, 2, 3]

Exemple: Count truthy values.

[true, false, nil, "hey", 4].count(&canal)
=> 3

Fetch key in list of hash.

people = [{ name: "Alice" }, { name: "Bob" }]
people.map(&canal[:name])
=> ["Alice", "Bob"]

Multiply list of number by 2.

(0..5).map(&canal * 2)
=> [0, 2, 4, 6, 8, 10]

Add this line to your application's Gemfile:

gem 'canal'

And then execute:

$ bundle

Or install it yourself as:

$ gem install canal