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2-queue.js
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44 lines (37 loc) · 812 Bytes
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'use strict';
class Queue {
constructor() {
this.first = null;
this.last = null;
}
put(item) {
const last = this.last;
const element = { next: null, item };
if (last) last.next = element;
else this.first = element;
this.last = element;
}
pick() {
const element = this.first;
if (!element) return null;
if (this.last === element) {
this.first = null;
this.last = null;
} else {
this.first = element.next;
}
return element.item;
}
}
// Usage
const obj1 = { name: 'first' };
const obj2 = { name: 'second' };
const obj3 = { name: 'third' };
const queue = new Queue();
queue.put(obj1);
queue.put(obj2);
queue.put(obj3);
console.dir(queue.pick());
console.dir(queue.pick());
console.dir(queue.pick());
console.dir(queue.pick());