Đây là quá trình triển khai hoàn chỉnh của lớp PriorityQueue -
Ví dụ
class PriorityQueue {
constructor(maxSize) {
// Set default max size if not provided
if (isNaN(maxSize)) {
maxSize = 10;
}
this.maxSize = maxSize;
// Init an array that'll contain the queue values.
this.container = [];
}
// Helper function to display all values while developing
display() {
console.log(this.container);
}
// Checks if queue is empty
isEmpty() {
return this.container.length === 0;
}
// checks if queue is full
isFull() {
return this.container.length >= this.maxSize;
}
enqueue(data, priority) {
// Check if Queue is full
if (this.isFull()) {
console.log("Queue Overflow!");
return;
}
let currElem = new this.Element(data, priority);
let addedFlag = false;
// Since we want to add elements to end, we'll just push them.
for (let i = 0; i < this.container.length; i++) {
if (currElem.priority < this.container[i].priority) {
this.container.splice(i, 0, currElem);
addedFlag = true; break;
}
}
if (!addedFlag) {
this.container.push(currElem);
}
}
dequeue() {
// Check if empty
if (this.isEmpty()) {
console.log("Queue Underflow!");
return;
}
return this.container.pop();
}
peek() {
if (isEmpty()) {
console.log("Queue Underflow!");
return;
}
return this.container[this.container.length - 1];
}
clear() {
this.container = [];
}
}
// Create an inner class that we'll use to create new nodes in the queue
// Each element has some data and a priority
PriorityQueue.prototype.Element = class {
constructor(data, priority) {
this.data = data;
this.priority = priority;
}
};