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Filename : memoize.js

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var _has = require('./_has.js');

// Memoize an expensive function by storing its results.
function memoize(func, hasher) {
  var memoize = function(key) {
    var cache = memoize.cache;
    var address = '' + (hasher ? hasher.apply(this, arguments) : key);
    if (!_has(cache, address)) cache[address] = func.apply(this, arguments);
    return cache[address];
  };
  memoize.cache = {};
  return memoize;
}

module.exports = memoize;