| Path : /var/www/html/infraai.ai/frontend/node_modules/webpack/lib/util/ |
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| Current File : /var/www/html/infraai.ai/frontend/node_modules/webpack/lib/util/Queue.js |
/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
/**
* FIFO queue that keeps items unique by storing them in insertion order inside
* a `Set`.
* @template T
*/
class Queue {
/**
* Seeds the queue with an optional iterable of initial unique items.
* @param {Iterable<T>=} items The initial elements.
*/
constructor(items) {
/**
* @private
* @type {Set<T>}
*/
this._set = new Set(items);
}
/**
* Returns the number of unique items currently waiting in the queue.
* @returns {number} The number of elements in this queue.
*/
get length() {
return this._set.size;
}
/**
* Enqueues an item, moving nothing if that value is already present.
* @param {T} item The element to add.
* @returns {void}
*/
enqueue(item) {
this._set.add(item);
}
/**
* Removes and returns the oldest enqueued item.
* @returns {T | undefined} The head of the queue of `undefined` if this queue is empty.
*/
dequeue() {
const result = this._set[Symbol.iterator]().next();
if (result.done) return;
this._set.delete(result.value);
return result.value;
}
}
module.exports = Queue;