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33 lines
797 B
JavaScript
33 lines
797 B
JavaScript
/**
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* @template V
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* @param {number} [maxSize]
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*/
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export function createMapCache(maxSize = 100) {
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/** @type {Map<string, V>} */
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const map = new Map();
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return {
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/** @param {string} key @returns {V | undefined} */
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get(key) {
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return map.get(key);
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},
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/** @param {string} key @returns {boolean} */
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has(key) {
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return map.has(key);
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},
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/** @param {string} key @param {V} value */
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set(key, value) {
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if (map.size >= maxSize && !map.has(key)) {
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const first = map.keys().next().value;
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if (first !== undefined) map.delete(first);
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}
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map.set(key, value);
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},
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};
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}
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/**
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* @template V
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* @typedef {{ get: (key: string) => V | undefined, has: (key: string) => boolean, set: (key: string, value: V) => void }} MapCache
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*/
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