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queue.js
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38 lines (35 loc) · 984 Bytes
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class Node {
constructor(val) {
this.value = val;
this.next = null;
}
}
class Queue {
constructor() {
this.first = null;
this.last = null;
this.size = 0;
}
enqueue(val) {
let newNode = new NOde(val);
if(!this.first) {
this.first = newNode;
this.last = newNode;
} else {
this.last.next = newNode; // linked list!!
this.last = newNode;
}
this.size++;
return this.last.value;
}
dequeue(val) {
if (!this.first) return null; // 큐가 비었을 때
let temp = this.first;
if (this.first === this.last) { // 큐에 하나만 있을 때
this.last = null // this.first를 써야해서 this.null을 지움
}
this.first = this.first.next; // 맨 앞에 있는 요소의 다음 요소를 큐의 맨 앞요소로 바꿈
this.size--;
return temp.value;
}
}