Ember.js conceptual interview questions

Explain what and how does Ember.js work?

Ember.js is used to build web applications that remove boilerplate while offering a generic structure for applications.

Ember helps create applications whose logic is running in the browser and also does not require functional server requests. Ember update the DOM directly and immediately when any user interacts on the browser page with things such as buttons and text boxes.

List Ember.js ' key components?

  • Models

  • Router

  • Controllers

  • Views

  • Templates

  • Helpers

Explain what is the Ember.js model?

A template object is used in an Ember application to store persistent state. Such design objects the models back and provides data that will be presented in the HTML.

Explain how to build ember applications?

The ember.js framework is based on MVC (Model, View, Controller) System :

  • Model: it describes the information used in the

  • Controllers : it modifies request and edit data and provides user experiences

  • Views: shows data and records user behavior.

Explain how different is ember.js from traditional web apps?

With Ember.js, an ember.js application installs everything you need to run in the initial page load instead of most of the functionality of your software sitting on the database. Therefore, while using the app, the user does not have to load a new page and the UI will respond quickly. The benefit of this model is that the same REST API as your native app is used by your web application.

Explain how to use the Router and{ outlet} tag in ember.js?

Router allows you to define all possible state of an app and map it to urls To construct a section hierarchy by providing a mean for a container model to include a child template using the{{ outlet}} tag.

Explain what is the difference in ember.js between router and route?

  • Router: This is the point of connection between the address bar of the browser and our request. It translates address into route.

  • Route: this is where a user request will land once a router has translated it. Route decides which data the template should receive.

Explain what Ember-data is?

Ember-Data is a library where records are retrieved from a server, stored, updated in the browser, and saved back to the server.

Explain the role of adapters and adapter types?

Adapter queries the rear end, each adapter consists of a different rear end. Rest adapter handles JSON APIs, for example, and LSAdapter handles local storage.

Explain the two ways a view can be defined and inserted?

First, you need to create an object in your JavaScript to define a view by extending the Em. View class. You can declare within that your functions and variables.

Now you need to follow the handlebar script{{ #view App. ViewName}}.

Second Way to insert a view into your template. This method does not include the name of the view object when adding it into the template. But inside the object you have another property called templateName that should be initialized in your template with the same value as the name template attribute in the script tag of the handlebar.

Address the components of the model used in ember.js?

Ember.js model components are

  • Partial

  • View

  • Render

  • Yield

  • Outlet

Explain what is serializer?

A serializer is responsible for turning a raw JSON (JavaScript Object Notation) payload back into a file object from your database. In many different ways, JSON APIs can represent attributes and relationships.

How can you describe a new class of ember?

On Ember.object, you can use the extens() method to define a new ember class.

Explain how to add data to an application using fixture?

Until linking the request for long-term persistence, fixtures are used to bring sample data into an application.

Next modify js / application.js to show that an extension of the DS.FixtureAdapter is the application adapter of your device. Adapters are used to communicate with your application's data source. This will generally be an API for the web service.

Update the js / models / todo.js file next.

Mention some of the functions used in ember packages/ember run-time/lib and packages/ember metal/lib/utils.js ?

  • None: returns tur if the argument is null or undefined

  • Empty: Utility function restricts the rules on ember.none by returning false for empty string and empty arrays

  • isArray: use this to check if the value is a array

  • MakeArray : this function is used when you want a given object in a array

  • Typeof : this function is used to get the passed argument type

  • Compare: used to compare two possible objects.

  • inspect: While debugging this function is useful. For a given object it returns the string description

  • Log_Binding: Log binding is not a function but a Boolean function. If set true ember will log all the activity that is happening on the bindings.

Explain what is Ember.js Enumerables?

An enumerable in Ember.js is any object that contains a number of child objects and allows you to deal with them using the Ember. Enumerable API. Native JavaScript array is the most popular enumerable in most Apps.

Explain what is and what is the advantage of Ember. ArrayController?

Ember. ArrayController is a controller which wraps an underlying array and adds additional visual layer functionality. The downside is that you only need to set up a binding view once.

Explain what is the class of ember.mixin?

Ember.mixin class can build objects that, among other instances and classes, can share functions and properties. This will help to communicate both object actions and object design.

What is Ember. Class. Namespace?

Typically a Namespace. Class is used to describe an entity containing certain objects or methods like an application or framework.

If you can use Ember. TrackedArray?

It is possible to use Ember. TrackedArray to track Array operations. In a state, it may be more efficient to measure the indexes of items in an array after subsequent operations have passed them.

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