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lambdalisue/sum.coffee

Created August 28, 2011 17:09
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sum.coffee
Array::fold = (f, init)->
c = init
for e in this
c = f(e, c)
c
if Array::reduce is undefined
Array::reduce = (f) -> @[1..].fold(f, @[0])
sum = (a)->
a.reduce (e, c) -> e + c
alert sum([1..20]) #...shows 210
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