Ember.js Ember.NativeArray compact() Method

Last Updated : 26 Apr, 2025

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 compact() method is used to get the new array without all null or undefined elements.

Syntax:

compact();

Parameters: It does not take any parameters.

Return Value: An array without null and undefined.

Steps to Install and Run Ember.js:

Step 1: 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

Step 2: 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 server

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

ember generate route compact1

app/routes/compact1.js

Javascript

import Route from '@ember/routing/route';
 
export default class ListRoute extends Route {
    list = [
        "Digital Camera",
        "Speakers",
        "Balloons",
        "Scissors",
        null,
        "Table Confetti",
        null,
        "Wine",
        "Napkins",
        "Party Plates",
        null,
        "Music System",
        "Cups",];
    list2 = [
        "Laptop",
        "Bad",
        "Head Phone",
        "Bluetooth",
        'Phone',
        'Shoes',
    ]
    item;
    idx;
    model() {
        return this.list;
    }
    setupController(controller, model) {
        super.setupController(controller, model);
        controller.set('list', this.list);
        controller.set('list2', this.list2);
        controller.set('item', this.item);
        controller.set('idx', this.idx);
    }
}

app/controllers/compact.js

Javascript

import Ember from 'ember';
import { reverseObjects, uniq, setObjects, unshiftObject }
    from '@ember/array';
 
export default Ember.Controller.extend({
    actions: {
        clear() {
            this.list.clear();
        },
        remove_null() {
            let k = this.list.compact();
            this.list.setObjects(k);
        },
        add_item(item) {
            this.list.addObject(item);
        },
        Add_list() {
            this.list.addObjects(this.list2);
        },
        check_item(data) {
            let ans = this.list.find((item) =>
                item == data);
            alert(ans ? `${ans} is present in list` :
                `${data} is not present in list`);
        },
    },
});

app/templates/compact1.hbs

Javascript

{{page-title "compact"}}
<h3>Here is a list of Items: </h3>
<ul>
    {{#each @model as |i|}}
        <li>{{i}}</li>
    {{/each}}
</ul>
<br />
<div>
    <label>Enter Item: </label>
    {{input value=this.item2}}
</div>
<div>
    <input
        type="button"
        id="check-item"
        value="Check Item"
        {{action "check_item" this.item2}}
    />
</div>
 
<br />
<div>
    <label>Enter Item: </label>
    {{input value=this.item}}
</div>
<div>
    <input
        type="button"
        id="insert-item"
        value="Insert Item"
        {{action "add_item" this.item}}
    />
</div>
<br />
<input
    type="button"
    id="append-list"
    value="Append More Items"
    {{action "Add_list"}}
/>
 
<br /><br />
<input
    type="button"
    id="reverse_list"
    value="Remove null"
    {{action "remove_null"}}
/>
<br /><br />
<input type="button" id="clear"
       value="Clear"
       {{action "clear"}} />
{{outlet}}

Output: Visit localhost:4200/clear1 to view the output

Ember.js Ember.NativeArray compact method

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

ember generate route compact2

app/routes/compact.js

Javascript

import Route from '@ember/routing/route';
 
export default class PartyRoute extends Route {
    partyItems = [
        'Oxygen',
        'Tenet',
        undefined,
        'Source Code',
        'Infine',
        'Loopert',
        'Tenet',
        undefined,
        'SpiderHead',
        'The Thing',
        undefined,
        'A Quiet Place',
        'The Invisible Man',
        'Looper',
        'The Thing',
        'Ad Astra',
        undefined,
    ];
    list = [
        'Shutter Island',
        'Matrix',
        'Avatar',
        'Fantastic Beast',
        'Avengers',
        'Fantastic four',
        'HulK',
        'Superman',
        'Spiderman',
        'The Batman'
    ];
    item;
    idx;
    model() {
        return this.partyItems;
    }
    setupController(controller, model) {
        super.setupController(controller, model);
        controller.set('partyItems', this.partyItems);
        controller.set('item', this.item);
        controller.set('idx', this.idx);
        controller.set('list', this.list);
    }
}

app/controllers/compact2.js

Javascript

import Ember from 'ember';
import { reverseObjects, unshiftObject, uniq, }
    from '@ember/array';
 
export default Ember.Controller.extend({
    actions: {
        delete() {
            this.partyItems.clear();
 
        },
        insert(data) {
            this.partyItems.addObject(data);
        },
        add() {
            this.partyItems.addObjects(this.list);
        },
        remove() {
            let res = this.partyItems.compact();
            this.partyItems.setObjects(res)
        },
        check(data) {
            let ans = this.partyItems.find((item) =>
                item == data);
            alert(ans ? `${ans} present in list` :
                `${data} not present in list`)
        }
    },
});

app/templates/compact2.hbs

Javascript

{{page-title "compact"}}
<h3>Here is a list of items: </h3>
<ul>
    {{#each @model as |party|}}
        <li>{{party}}</li>
    {{/each}}
</ul>
<br />
<div>
    <label>Enter Item: </label>
    {{input value=this.item}}
</div>
<div>
    <input
        type="button"
        id="insert-item"
        value="Insert item"
        {{action "insert" this.item}}
    />
</div>
<br />
<div>
    <label>Enter Item: </label>
    {{input value=this.item2}}
</div>
<div>
    <input
        type="button"
        id="check-item"
        value="check item"
        {{action "check" this.item2}}
    />
</div>
<br />
<input
    type="button"
    id="append-list"
    value="Append More Movies"
    {{action "add"}}
/>
 
<br />
<br />
<input
    type="button"
    id="remove-undefined"
    value="Remove undefined"
    {{action "remove"}}
/>
 
<br />
<br />
<input  type="button" id="del_list"
        value="Delete All"
        {{action "delete"}} />
{{outlet}}