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Last active July 31, 2019 18:56
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array.rb
class Array
def function_map(function)
each_with_object [] do |item, result|
result << function.call(item)
end
end
end
[1, 2, 3].function_map ->(n) { n.to_s * 2 }
#=> ["11", "22", "33"]
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