队列（基于数组）

class Queue {
    constructor() {
        this.list = []
    }
    push(value) {
        this.list.push(value)
    }
    pop() {
        return this.list.shift()
    }
    peek() {
        return this.list[0]
    }
    isEmpty() {
        return this.list.length === 0
    }
    clear() {
        this.list = []
    }
    size() {
        return this.list.length
    }
    toString() {
        return this.list.join(",")
    }
}


// 测试代码
const queue = new Queue();
queue.push(1)
queue.push(3)
queue.push(5)
queue.pop();
queue.push(7)
console.log(queue.toString())
console.log(queue.peek())
console.log(queue.size())
console.log(queue.isEmpty())
queue.clear();
console.log(queue.toString())
console.log(queue.isEmpty())