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29 lines
483 B
JavaScript
29 lines
483 B
JavaScript
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/**
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* @param {Function} fn
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*/
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function memoize(fn) {
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let cache = new Map();
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return function(...args) {
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let key = JSON.stringify(args);
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if (!cache.has(key)) {
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cache.set(key, fn(...args));
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}
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return cache.get(key);
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}
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}
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/**
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* let callCount = 0;
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* const memoizedFn = memoize(function (a, b) {
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* callCount += 1;
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* return a + b;
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* })
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* memoizedFn(2, 3) // 5
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* memoizedFn(2, 3) // 5
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* console.log(callCount) // 1
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*/
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