Here are a few Ember js Questions provided with their answers, which you may encounter while being interviewed and will help you crack the interview on Ember Js
Ember comes with a data management library called Ember data which deals with application data that defines the structure of the data. We can generate ember-data model using Ember CLI. The main purpose of an ember-data is that it is a library that integrates tightly with ember.js to make it easy to retrieve records from a server, cache them for performance, save updates back to the server and create new records on the client.
Defining a component in Ember.js: Ember generate component component_name;
I-app:- This is where folders and files for models, components, routes, templates, and styles are stored.
I-bower_components/ bower.json:- Bower is a dependency management tool which is used in Ember CLI to manage front-end plugins and component dependencies.
I-config:- The config directory contains the environment.js where we can configure settings for your app.
I-dist:-When we build our app for deployment, the output files will be created here.
I-node_nodules/package.json:- Directory and files are from npm. Npm is the package manager for node.js.
Public:- This directory contains assets such as image and fonts.
Vendor:- This directory is where front-end dependencies that are not managed by Bower go.
Tests/testem.js:- Automated tests for our app go in the test folder, and testem is configured in testem.js.
Tmp:- Ember CLI temporary files live here.
Ember-cli-build.js:- This file describes how Ember CLI should build our app.
An ember route is built with three parts:
In ember when we want to make a new page that can be visited using a URL, we need to generate a “route” using Ember CLI. Hence the generator will print out:
To define a route, run ember generate route route-name. This command will generate a file name route-name.js in app/routes/ folder.
It is a long-lived Ember object that can be made available in different parts of your application. It is created using the following syntax- “ember.service”
Example uses of Ember.js services include:
Services are generated with the help of ember CLI’s service generator. If you want to access a service, inject it either in an initializer or use the following syntax- “ember.inject”. Using this you can even access the properties and methods using services. Use the following syntax to define a service:
ember generate service service_name;
Ember supports observing any property which also includes computed properties. Observers are something which contains the behavior that reacts to the changes made in other properties. Observers are used when we need to perform some behavior after a binding has finished synchronizing. New ember developers often use observers. Observers are mostly used within the ember framework and for that; computed properties are the appropriate solution. An observer can be set on an object using the following syntax- “ember.observer” Observers in ember are synchronous. They will fire as soon as they observe a change in of the properties. And, because of this, it is easy to introduce bugs where properties are not yet synchronized.
We can install Ember with a single command using npm such as: -npm install –g firstname.lastname@example.org. We can use ember new command to create a new application:- ember new ember-quickstart. This command will create a new directory called ember-quickstart and set up a new Ember application inside it. Outside, the application will include a development server. We can start a development server by typing the command:
To stop the development server at any time simply type Ctrl-c in our terminal.
Models are objects that represent the underlying data which is presented to the user by your application. Different applications have different objects or models, and it depends completely on what problem they are trying to solve. For example, a photo album is a collection of many photos i.e. group of photos. And, a photo sharing application has a photo model to represent a particular photo. Models are persistent and most of them are loaded from and saved to a server that uses the database to store data. Once the models are loaded from the storage, the components translate the data into the user interface with which the user can interact. Defining model in ember.js: –
ember generate model model_name;
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