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bgmarx/gist:9e23f8d651782fcd9226

Created April 17, 2015 20:45
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gistfile1.rb
def map
[].tap { |out| each { |e| out << yield(e) } }
end
def select
[].tap { |out| each { |e| out << if e yield(e) } }
end
def sort_by
map { |a| [yield(a), a] }.sort.map { |a| a[1] }
end
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