'use strict';

class TimeoutCollection {

constructor(timeout) {

this.timeout = timeout;

this.collection = new Map();

this.timers = new Map();

}

set(key, value) {

const timer = this.timers.get(key);

if (timer) clearTimeout(timer);

const timeout = setTimeout(() => {

this.delete(key);

}, this.timeout);

timeout.unref();

this.collection.set(key, value);

this.timers.set(key, timeout);

}

get(key) {

return this.collection.get(key);

}

delete(key) {

const timer = this.timers.get(key);

if (timer) {

clearTimeout(timer);

this.collection.delete(key);

this.timers.delete(key);

}

}

toArray() {

return [...this.collection.entries()];

}

}

// Usage

const hash = new TimeoutCollection(1000);

hash.set('uno', 1);

console.dir({ array: hash.toArray() });

hash.set('due', 2);

console.dir({ array: hash.toArray() });

setTimeout(() => {

hash.set('tre', 3);

console.dir({ array: hash.toArray() });

setTimeout(() => {

hash.set('quattro', 4);

console.dir({ array: hash.toArray() });

}, 500);

}, 1500);