memo_weakmap.js
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memo_weakmap.js
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function memoize(fn) {↵
const cache = new WeakMap();↵
return function(...args) {↵
const key = args[0];↵
if (typeof key !== 'object' || key === null) {↵
return fn.apply(this, args);↵
}↵
if (!cache.has(key)) {↵
cache.set(key, fn.apply(this, args));↵
}↵
return cache.get(key);↵
};↵
}
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