viem
Version:
37 lines • 977 B
JavaScript
/**
* Map with a LRU (Least recently used) policy.
*
* @link https://en.wikipedia.org/wiki/Cache_replacement_policies#LRU
*/
export class LruMap extends Map {
constructor(size) {
super();
Object.defineProperty(this, "maxSize", {
enumerable: true,
configurable: true,
writable: true,
value: void 0
});
this.maxSize = size;
}
get(key) {
const value = super.get(key);
if (super.has(key)) {
super.delete(key);
super.set(key, value);
}
return value;
}
set(key, value) {
if (super.has(key))
super.delete(key);
super.set(key, value);
if (this.maxSize && this.size > this.maxSize) {
const firstKey = super.keys().next().value;
if (firstKey !== undefined)
super.delete(firstKey);
}
return this;
}
}
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