Ember.js Ember.Templates.helpers log() 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 log() method is used to display the value of variables in the current rendering context. 

Syntax:

{{ log params }}

Parameters: 

• params: It is an array of variables that we want to show in the output. 

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 log1

app/route/log1.js

Javascript

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

export default class PartyRoute extends Route {
    person = [
        'Aman',
        'Arabh',
        'Sonu',
        'Saurabh',
        'Satyam',
    ];
    item;
    idx;
    len;
    model() {
        return this.person;
    }
    setupController(controller, model) {
        super.setupController(controller, model);
        controller.set('person', this.person);
        controller.set('item', this.item);
        controller.set('idx', this.idx);
        controller.set('len', this.len);
    }
}

app/components/arr2.hbs

HTML

{{@greet}} to GeeksforGeeks site<br/>

{{log @greet 'to GeeksforGeeks site'}}

app/templates/log1.hbs

HTML

{{#each @model as |temp|}}
    {{arr2 greet=(concat "Welcome " temp)}}
{{/each}}

Output:

Ember.js Ember.Templates.helpers log() Method

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

ember generate route log2

app/components/arr.js

Javascript

import Component from '@glimmer/component';
import { tracked } from '@glimmer/tracking';

export default class extends Component {
    food = [{
        "food": "Banana",
        "Quant": 5
    },
    {
        "food": "Pine-apple",
        "Quant": 2
    },
    {
        "food": "Apple",
        "Quant": 7
    },
    {
        "food": "Mango",
        "Quant": 4
    }];
}

app/components/app.hbs

HTML

{{yield}}
{{#each this.food as | item |}}
<div>
    <ul>
        {{#each-in item as | key value|}}
            <li>{{ key }} : {{ value }}</li>
            {{log key ':' value}}
        {{/each-in}}
    </ul>
</div>
{{/each}}

app/templates/log2.hbs

HTML

<Arr>
    <h1>
        List of Foods:
    </h1>
</Arr>
{{outlet}}

Output:

Ember.js Ember.Templates.helpers log() Method

Reference: https://api.emberjs.com/ember/4.6/classes/Ember.Templates.helpers/methods/log?anchor=log