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satyr/fib.coffee

Forked from hakobe/fib.coffee
Created April 30, 2011 14:04
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fib.coffee
crypto = require 'crypto'
key = (values) ->
crypto.createHash('sha1').update(values.join '-').digest 'hex'
memoize = (f, memo = {}) ->
-> memo[key [this, arguments...]] ||= f.apply this, arguments
fib = memoize (n) -> if n < 2 then n else fib(n-1) + fib(n-2)
console.log fib 10
console.log fib 55
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