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queue.js
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queue.js
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// define a Queue class based on singly linked list
class Node{
constructor(value){
this.value = value;
this.next = null;
}
}
class Queue{
constructor(){
this.first = null;
this.last = null;
this.size = 0;
}
add(value){
let newNode = new Node(value);
if(!this.first){
this.first = newNode;
this.last = newNode;
} else {
this.last.next = newNode;
this.last = newNode;
}
this.size++;
return this;
}
remove(){
if(!this.first) return undefined;
if(this.size === 1){
this.first = null;
this.last = null;
}
let removedNode = this.first;
this.first = removedNode.next;
this.size--;
return removedNode.value;
}
}
let queue = new Queue();
queue.add(1);
queue.add(2);
queue.add(3);
console.log(queue.remove());
console.log(queue.remove());