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/**

* Created by lei.sun on 2017/8/13.

*/

// 队列

function Queue() {

this.dataStore = [];

this.enqueue = enqueue; // 入队

this.dequeue = dequeue; // 出队

this.front = front;

this.back = back;

this.toString = toString;

this.empty = empty;

}

function enqueue(element) {

this.dataStore.push(element);

}

function dequeue() {

return this.dataStore.shift();

}

function front() {

return this.dataStore[0];

}

function back() {

return this.dataStore[this.dataStore.length - 1];

}

function toString() {

var retStr = "";

for (var i = 0; i < this.dataStore.length; ++i) {

retStr += this.dataStore[i] + "\n";

}

return retStr;

}

function empty() {

if (this.dataStore.length == 0) {

return true;

} else {

return false;

}

}

// 测试

var q = new Queue();

q.enqueue("Cynthia");

q.enqueue("Raymond");

q.enqueue("Barbara");

console.log(q.toString());

q.dequeue();

console.log(q.toString());

console.log("Front of queue：" + q.front());

console.log("Back of queue：" + q.back());

// 实例

// 使用队列：方块舞的舞伴分配问题

// 使用队列对数据进行排序

// 优先队列

this.enqueue = function(element, priority){

let queueElement = new QueueElement(element, priority);

let added = false;

for (let i=0; i<items.length; i++){

if (queueElement.priority < items[i].priority){ // {2}

items.splice(i,0,queueElement); // {3}

added = true;

break; // {4}

}

}

if (!added){

items.push(queueElement); //{5}

}

};