freeCodeCamp/guide/spanish/certifications/coding-interview-prep/data-structures/create-a-stack-class/index.md

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2018-10-12 19:37:13 +00:00
---
title: Create a Stack Class
localeTitle: Crear una clase de pila
---
## Crear una clase de pila
### Método:
* La pila es una estructura de datos abstracta.
* La pila sigue el principio LIFO / FILO.
## \- En este desafío, debemos agregar los `.push()` , `.pop()` , `.peek()` , `.isEmpty()` y `.clear()` a la clase.
* `push()` método `push()` empuja el valor a la pila.
* `pop()` método `pop()` saca el primer valor de la pila.
* `peek()` método `peek()` devuelve el primer valor de la pila.
* `isEmpty()` método `isEmpty()` verifica si esta pila está vacía.
## \- `.clear()` método `.clear()` elimina todos los elementos de la pila.
| DS | Acceso | Búsqueda | Insertar | Eliminar | | ----- | ------ | ------ | ------ | ------ | | Pila | n | n | 1 | 1 |
### Solución:
#### BASIC:
```js
function Stack() {
var collection = [];
this.print = function() {
console.log(collection);
};
this.push = function(val){
return collection.push(val);
}
this.pop = function(){
return collection.pop();
}
this.peek = function(){
return collection[collection.length-1];
}
this.isEmpty = function(){
return collection.length === 0;
}
this.clear = function(){
collection.length = 0;
}
}
```
#### Avanzado - Sintaxis de la clase ES6:
```js
class Stack {
constructor() {
this.collection = [];
}
print(){
console.log(this.collection);
}
push(val){
retiurn this.collection.push(val);
}
pop(){
return this.collection.pop();
}
peek(){
return this.collection[this.collection.length-1];
}
isEmpty(){
return this.collection.length === 0;
}
clear(){
return this.collection.length = 0;
}
}
```
\### Recursos:
* [Wikipedia](https://en.wikipedia.org/wiki/Stack_(abstract_data_type))