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class Node {
/// value;
/// next;
constructor(value) {
this.value = value;
// TODO: Remove this when targeting Node.js 12.
this.next = undefined;
}
}
class Queue {
// TODO: Use private class fields when targeting Node.js 12.
// #_head;
// #_tail;
// #_size;
constructor() {
this.clear();
}
enqueue(value) {
const node = new Node(value);
if (this._head) {
this._tail.next = node;
this._tail = node;
} else {
this._head = node;
this._tail = node;
}
this._size++;
}
dequeue() {
const current = this._head;
if (!current) {
return;
}
this._head = this._head.next;
this._size--;
return current.value;
}
clear() {
this._head = undefined;
this._tail = undefined;
this._size = 0;
}
get size() {
return this._size;
}
* [Symbol.iterator]() {
let current = this._head;
while (current) {
yield current.value;
current = current.next;
}
}
}
module.exports = Queue;