JavaScript Patterns 4.8 Function Properties - A Memoization Pattern
Gets a length property containing the number of arguments the function expects:
function func(a, b, c) {} console.log(func.length); // var myFunc = function () { // serialize the arguments object as a JSON string and use that string as a key in your cache object var cachekey = JSON.stringify(Array.prototype.slice.call(arguments)), if (!myFunc.cache[cachekey]) { var result = {}; // ... expensive operation ... myFunc.cache[cachekey] = result; } return myFunc.cache[cachekey]; }; // cache storage myFunc.cache = {};
References:
JavaScript Patterns - by Stoyan Stefanov (O`Reilly)
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