Ember.js MutableArray popObject() Method

Ember.js is an open-source JavaScript framework used for developing large client-side web applications which is based on Model-View-Controller (MVC) architecture. Ember.js is one of the most widely used front-end application frameworks. It is made to speed up development and increase productivity. Currently, it is utilized by a large number of websites, including Square, Discourse, Groupon, Linked In, Live Nation, Twitch, and Chipotle.

The popObject() method is used to pop objects from an array.

Syntax:

popObject()

Returns: Object popped

To run the following examples you will need to have an ember project with you. To create one, you will need to install ember-cli first. Write the below code in the terminal:

npm install ember-cli

Now you can create the project by typing in the following piece of code:

ember new <project-name> --lang en

To start the server, type:

ember serve

Example 1: Type the following code to generate the route for this example:

ember generate route notepad

app/routes/notepad.js

Javascript

import Route from '@ember/routing/route';

export default class NotepadRoute extends Route {
    items = ['Bread', 'Facewash', 'Egg', 'Pen', 'Medicine'];
    model() {
        return this.items;
    }
    setupController(controller, model) {
        this._super(controller, model);
        controller.set('items', this.items);
    }
}

app/controllers/notepad.js

Javascript

import Ember from 'ember';
import { popObject } from '@ember/array';

export default Ember.Controller.extend({
    actions: {
        removeItem() {
            if (this.items.length == 0)
                alert('Item List is Empty');
            this.items.popObject();
        }
    }
})

app/template/notepad.hbs

HTML

{{page-title "Notepad"}}

<h2>Your Items</h2>

<ul>
    {{#each @model as |i|}}
    <li>{{i}}</li>
    {{/each}}
</ul>

<br/><br/>

<div>
    <input type="button" id="remove-item"
         value="Remove Item" {{action 'removeItem'}}/>
</div>

{{outlet}}

Output: Visit localhost:4200/notepad to view the output

Example 2: Type the following code to generate the route for this example:

ember generate route richest-people

app/routes/richest-people.js

Javascript

import Route from '@ember/routing/route';
import { classify, w } from '@ember/string';

export default class RichestPeopleRoute extends Route {
  richestPeople = ['elon Musk', 'bernard Arnault and family',
        'jeff Bezos', 'Bill gates', 'gautam adani and family',
        'Larry Page', 'Warren Buffet', 'larry Ellison',
    'mukesh ambani', 'sergey brin'];
  num = 10;
  init() {
    this.richestPeople = this.richestPeople.map(classify);
  }
  model() {
    this.init();
    return this.richestPeople;
  }
  setupController(controller, model) {
    this._super(controller, model);
    controller.set('num', this.num);
    controller.set('richestPeople',this.richestPeople)
  }
}

app/controllers/richest-people.js

Javascript

import Ember from 'ember';
import { popObject } from '@ember/array';

export default Ember.Controller.extend({
    actions: {
        set(n) {
            this.num = parseInt(n);
            while (this.richestPeople.length > this.num) {
                this.richestPeople.popObject();
            }
        }
    }
})

app/template/richest-people.hbs

HTML

{{page-title "Richest People"}}

<div>
    <label>Enter Value: </label>
    {{input value=this.num}}
</div>
<div>
    <input type="button" id="fetch"
         value="Fetch" {{action 'set' this.num}}/>
</div>
<br/><br/>

<h2>Top {{this.num}} Richest People in the World</h2>
<ul>
    {{#each @model as |rich-person|}}
    <li>{{rich-person}}</li>
    {{/each}}
</ul>

{{outlet}}

Output: Visit localhost:4200/richest-people to view the output

Reference: https://api.emberjs.com/ember/4.4/classes/MutableArray/methods