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noway.gabb.fr
1// eslint-disable-next-line import/prefer-default-export
2export function memoize<T extends unknown[], S>(
3 fn: (...args: T) => S,
4 hashFn: (...args: unknown[]) => string = JSON.stringify,
5 entryLimit = 5,
6): (...args: T) => S {
7 const cache: Map<string, S> = new Map();
8
9 return (...args: T) => {
10 const value = hashFn(args);
11 if (cache.has(value)) {
12 return cache.get(value);
13 }
14
15 const returnedValue: S = fn.apply(this, args);
16
17 if (cache.size >= entryLimit) {
18 const iterator = cache.keys();
19 const firstValue = iterator.next().value;
20 // remove oldest value
21 cache.delete(firstValue);
22 }
23 cache.set(value, returnedValue);
24 return returnedValue;
25 };
26}