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monorkin/proc_<<_simple_example.rb

Created December 23, 2018 21:23
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proc_<<_simple_example.rb
f = -> x { x + 2 }
g = -> x { x * 2 }
# h is the composition of g and f
h = f << g
# h is the same as -> x { (x * 2) + 2 }
[1, 2, 3].map(&h) # => [4, 6, 8]
# This is exactly the same as
[1, 2, 3].map(&g).map(&f) # => [4, 6, 8]
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