在JavaScript中实现堆栈和队列的最佳方法是什么?
我想做调车场算法我需要这些数据结构。
在JavaScript中实现堆栈和队列的最佳方法是什么?
我想做调车场算法我需要这些数据结构。
当前回答
你可以使用WeakMaps来实现ES6类中的私有属性,以及JavaScript语言中String属性和方法的好处,如下所示:
const _items = new WeakMap();
class Stack {
constructor() {
_items.set(this, []);
}
push(obj) {
_items.get(this).push(obj);
}
pop() {
const L = _items.get(this).length;
if(L===0)
throw new Error('Stack is empty');
return _items.get(this).pop();
}
peek() {
const items = _items.get(this);
if(items.length === 0)
throw new Error ('Stack is empty');
return items[items.length-1];
}
get count() {
return _items.get(this).length;
}
}
const stack = new Stack();
//now in console:
//stack.push('a')
//stack.push(1)
//stack.count => 2
//stack.peek() => 1
//stack.pop() => 1
//stack.pop() => "a"
//stack.count => 0
//stack.pop() => Error Stack is empty
其他回答
在我看来,内建数组对于堆栈来说是很好的。如果你想在TypeScript中使用Queue,这里有一个实现
/**
* A Typescript implementation of a queue.
*/
export default class Queue {
private queue = [];
private offset = 0;
constructor(array = []) {
// Init the queue using the contents of the array
for (const item of array) {
this.enqueue(item);
}
}
/**
* @returns {number} the length of the queue.
*/
public getLength(): number {
return (this.queue.length - this.offset);
}
/**
* @returns {boolean} true if the queue is empty, and false otherwise.
*/
public isEmpty(): boolean {
return (this.queue.length === 0);
}
/**
* Enqueues the specified item.
*
* @param item - the item to enqueue
*/
public enqueue(item) {
this.queue.push(item);
}
/**
* Dequeues an item and returns it. If the queue is empty, the value
* {@code null} is returned.
*
* @returns {any}
*/
public dequeue(): any {
// if the queue is empty, return immediately
if (this.queue.length === 0) {
return null;
}
// store the item at the front of the queue
const item = this.queue[this.offset];
// increment the offset and remove the free space if necessary
if (++this.offset * 2 >= this.queue.length) {
this.queue = this.queue.slice(this.offset);
this.offset = 0;
}
// return the dequeued item
return item;
};
/**
* Returns the item at the front of the queue (without dequeuing it).
* If the queue is empty then {@code null} is returned.
*
* @returns {any}
*/
public peek(): any {
return (this.queue.length > 0 ? this.queue[this.offset] : null);
}
}
这里有一个笑话测试
it('Queue', () => {
const queue = new Queue();
expect(queue.getLength()).toBe(0);
expect(queue.peek()).toBeNull();
expect(queue.dequeue()).toBeNull();
queue.enqueue(1);
expect(queue.getLength()).toBe(1);
queue.enqueue(2);
expect(queue.getLength()).toBe(2);
queue.enqueue(3);
expect(queue.getLength()).toBe(3);
expect(queue.peek()).toBe(1);
expect(queue.getLength()).toBe(3);
expect(queue.dequeue()).toBe(1);
expect(queue.getLength()).toBe(2);
expect(queue.peek()).toBe(2);
expect(queue.getLength()).toBe(2);
expect(queue.dequeue()).toBe(2);
expect(queue.getLength()).toBe(1);
expect(queue.peek()).toBe(3);
expect(queue.getLength()).toBe(1);
expect(queue.dequeue()).toBe(3);
expect(queue.getLength()).toBe(0);
expect(queue.peek()).toBeNull();
expect(queue.dequeue()).toBeNull();
});
希望有人觉得这有用,
欢呼,
Stu
你可以使用WeakMaps来实现ES6类中的私有属性,以及JavaScript语言中String属性和方法的好处,如下所示:
const _items = new WeakMap();
class Stack {
constructor() {
_items.set(this, []);
}
push(obj) {
_items.get(this).push(obj);
}
pop() {
const L = _items.get(this).length;
if(L===0)
throw new Error('Stack is empty');
return _items.get(this).pop();
}
peek() {
const items = _items.get(this);
if(items.length === 0)
throw new Error ('Stack is empty');
return items[items.length-1];
}
get count() {
return _items.get(this).length;
}
}
const stack = new Stack();
//now in console:
//stack.push('a')
//stack.push(1)
//stack.count => 2
//stack.peek() => 1
//stack.pop() => 1
//stack.pop() => "a"
//stack.count => 0
//stack.pop() => Error Stack is empty
数组是Javascript中的堆栈。只需使用arr.push(x)和y = arr.pop()。
下面是用Javascript实现队列的最简单方法,对于enqueue(x)和y = dequeue(),它的平摊时间都是O(1)。它使用从插入索引到元素的映射。
function newQueue() {
return {
headIdx: 0,
tailIdx: 0,
elts: {},
enqueue: (elt) => queue.elts[queue.tailIdx++] = elt,
dequeue: () => {
if (queue.headIdx == queue.tailIdx) {
throw new Error("Queue is empty");
}
return queue.elts[queue.headIdx++];
},
size: () => queue.tailIdx - queue.headIdx,
isEmpty: () => queue.tailIdx == queue.headIdx
};
}
使用链表实现的队列比这种基于映射的方法更有效,使用循环缓冲区实现的队列比这种基于映射的方法更有效,但这两种数据结构的实现更复杂(特别是循环缓冲区数据结构)。
如果有人需要它,你可以使用这个NPM包https://www.npmjs.com/package/data-structures-typescript,它有一个队列和堆栈,它支持javascript和typescript,它是通用的,所以你可以用你自己的值类型;)
这是我的实现堆栈。
function Stack() {
this.dataStore = [];
this.top = 0;
this.push = push;
this.pop = pop;
this.peek = peek;
this.clear = clear;
this.length = length;
}
function push(element) {
this.dataStore[this.top++] = element;
}
function peek() {
return this.dataStore[this.top-1];
}
function pop() {
return this.dataStore[--this.top];
}
function clear() {
this.top = 0;
}
function length() {
return this.top;
}
var s = new Stack();
s.push("David");
s.push("Raymond");
s.push("Bryan");
console.log("length: " + s.length());
console.log(s.peek());