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memoizing recursive functions in javascript.
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| // attempt to make a swift-style generic memoize idiom ( https://gist.github.com/berkus/8a9e104f8aac5d025eb5 ) | |
| function memoize(body) { | |
| var memo = {}; | |
| return function memo_op(param) { | |
| if (memo[param] === undefined) | |
| memo[param] = body(memo_op, param); | |
| return memo[param]; | |
| } | |
| } | |
| var fibonacci = memoize(function (fibonacci, n) { | |
| return (n < 2 ? n : fibonacci(n-1) + fibonacci(n-2)); | |
| }); | |
| console.log(fibonacci(45) / fibonacci(44)); |
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| $ time node memoize.js | |
| 1.618033988749895 | |
| real 0m0.068s | |
| user 0m0.044s | |
| sys 0m0.021s |
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