@shutterstock/p-map-iterable/dist/src/queue.js

Set of classes used for async prefetching with backpressure (IterableMapper) and async flushing with backpressure (IterableQueueMapper, IterableQueueMapperSimple)

"use strict";
//
// 2021-08-27 - Based on simple example here: https://www.telerik.com/blogs/stack-queue-javascript
//
Object.defineProperty(exports, "__esModule", { value: true });
exports.Queue = void 0;
/**
 * A simple queue implementation.
 *
 * @category Low-Level
 */
class Queue {
    constructor() {
        this._queue = {};
        this._tail = 0;
        this._head = 0;
    }
    get length() {
        return this._tail - this._head;
    }
    // Add an element to the end of the queue.
    enqueue(element) {
        if (element === undefined) {
            throw new TypeError('cannot enqueue `undefined`');
        }
        this._queue[this._tail++] = element;
    }
    // Delete the first element of the queue.
    dequeue() {
        if (this._tail === this._head)
            return undefined;
        const element = this._queue[this._head];
        delete this._queue[this._head++];
        return element;
    }
}
exports.Queue = Queue;
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