Ember.js Helper concatenatedProperties Property

Ember.js is an open-source JavaScript framework used for developing large client-side web applications which are 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 concatenatedProperties property of Helper is used to define an array of properties that should be concatenated when extending a class.

Syntax: 

concatenatedProperties: [ propertyName ];

Parameters: It doesn’t take any parameters.

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 serve

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

ember generate route file1

app/helpers/concate.js

Javascript

import Helper from '@ember/component/helper';
import EmberObject from '@ember/object';

const Car = EmberObject.extend({
    concatenatedProperties: ['MODEL'],

    MODEL: ['XUV'],
});
export default class ConcatHelper extends Helper {
    mahindra = Car.extend({
        MODEL: ['Machindra'],
    });
    compute(params) {
        let l = this.mahindra.create({ MODEL: [...params] });
        console.log(l.get('MODEL'));
        return 'ConcatenatedProperties';
    }
}

app/routes/file1.hbs

HTML

{{page-title "Helper"}}
<h1>Welcome to the Route</h1>
<h1>{{concate 'Xuv 700' }}</h1>
{{outlet}}

Output:

Output1

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

ember generate route file2

app/routes/file2.js

Javascript

import Route from '@ember/routing/route';
import EmberObject from '@ember/object';
import ObjectProxy from '@ember/object/proxy';

export default class StudentsRoute extends Route {
    student;
    createStudent() {
        let student = EmberObject.extend({
            name: 'Satyam Sahu',
            gender: 'M',
            class: 12,
            grade: 'A',
            mobile: '9383933923',
            age: 28,
        });
        return student.create();
    }

    model() {
        this.student = this.createStudent();
        return this.student.get('mergedProperty');
    }
    setupController(controller, model) {
        super.setupController(controller, model);
        controller.set('student', this.student);
    }
}

app/helpers/concate.js

Javascript

import Helper from '@ember/component/helper';
import EmberObject from '@ember/object';

const Student_Id = EmberObject.extend({
    concatenatedProperties: ['Id'],

    Id: ['Enrollment_No : 239393 '],
});
export default class ConcatHelper extends Helper {

    compute(params) {
        let l = Student_Id.create({ Id: [params] });
        return l.Id;
    }
}

app/templates/file2.hbs

HTML

{{page-title "concatenatedProperties"}}
<table>

    <h1>Person</h1>
    <div><b>Name: {{this.student.name}}</b> </div>
    <div><b>Gender: {{this.student.gender}}</b></div>
    <div><b>Class: {{this.student.class}}</b></div>
    <div><b>Grade: {{this.student.grade}}</b></div>
    <div><b>Mobile: {{this.student.mobile}}</b></div>
    <div><b>Age: {{this.student.age}}</b></div>
    <div><b>Identification No.:</b>
        {{#each-in (concate 'Roll_No : 983938') as |key value|}}
        <li><b>
                {{value}}
            </b></li>
        {{/each-in}}
    </div>
</table>
{{outlet}}

Output:

Output2

Reference: https://api.emberjs.com/ember/4.9/classes/Helper/properties/concatenatedProperties?anchor=concatenatedProperties