Ember.js MutableArray popObject() Method
Last Updated :
20 Jul, 2022
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
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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
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Reference: https://api.emberjs.com/ember/4.4/classes/MutableArray/methods