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All Projects → hopsoft → pipe_envy

hopsoft / pipe_envy

Licence: MIT license
Elixir style pipe operator for Ruby

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ruby
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data-transformation

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Sponsor

PipeEnvy

WARNING

This lib is experimental & is probably not a good idea.

PipeEnvy overrides the pipe operator | on Array & Integer. It also adds it to Object.

Fun Stuff

Elixir's pipe operator is very cool & supports intuitive reasoning about data transformations similar to Unix pipelines.

"Elixir Rocks" |> String.upcase |> String.split # => ["ELIXIR", "ROCKS"]

Rubyists can now enjoy this same mental model of data transformation.

gem install pipe_envy
require "pipe_envy"

# refinements that apply extensions to Object, Array, & Integer in the current scope
using PipeEnvy

"Ruby Rocks" | :upcase | :split # => ["RUBY", "ROCKS"]

Here's a more sophisticated albeit contrived example. Notice that methods which require arguments are piped as Arrays.

magic = (1..100) \
  | :to_a \
  | [:select!, -> (i) { i.even? }] \
  | [:map, -> (i) { i ** 10 }] \
  | :sum \
  | Math.method(:sqrt) \
  | :to_s \
  | :chars \
  | :reverse \
  | [:[], 3] \
  | :to_i

# => 7

Be sure to check out Chainable Methods which offers similar behavior.

Here's another example similar to the one on the chainable_methods repo.

magic = "foo bar http://github.com/hopsoft/pipe_envy foo bar" \
  | URI.method(:extract) \
  | :first \
  | URI.method(:parse) \
  | :open \
  | :readlines \
  | :join \
  | Nokogiri::HTML.method(:parse) \
  | [:css, "h1"] \
  | :first \
  | :text \
  | :strip

# => "hopsoft/pipe_envy"
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