29 lines
729 B
JavaScript
29 lines
729 B
JavaScript
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/*@
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Ox.cache <f> Memoize a function
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<script>
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var f = Ox.cache(function(n) { return n * Math.random(); });
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</script>
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> f(10) == f(10);
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true
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> f(10) == f.clear()(10);
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false
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@*/
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Ox.cache = function(fn) {
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var cache = {},
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ret = function() {
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var key = JSON.stringify(Ox.makeArray(arguments));
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return key in cache ? cache[key]
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: (cache[key] = fn.apply(this, arguments));
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};
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ret.clear = function() {
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if (arguments.length == 0) {
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cache = {};
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} else {
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Ox.toArray(arguments).forEach(function(key) {
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delete cache[key];
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});
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}
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return ret;
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}
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return ret;
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};
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