Angular 6 Interview Questions

An Overview of Angular 6

Angular 6, released in May 2018, is backward compatible with Angular 5. This means projects created in Angular 5 will work seamlessly with Angular 6. Angular 6 has introduced the developers to a unique feature - Angular elements. This feature will allow the developers to render their Angular elements as essential web elements and will be looked upon as trusted HTML elements. This is an essential topic in Angular 6 Interview Questions for experienced professionals.

In the Updated Angular Command Line interface or CLI, new commands have been added such as ng-update for migrating from previous versions to the current version.

The updated Component Development Kit or CDK supports the creation of custom UI elements without the need for a material library. It also promotes responsive website layouts.

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The new multiple validators will allow the developers to include various validators on a form builder. Angular 6 also includes the updated Rxjs library, which means developers can enjoy the newest features in the latest version of RxJS 6 in their Angular app.

You can also find here Angularjs Interview Questions, Angular 2 Interview Questions, Angular 4 Interview Questions

Last update: 01 Jul 2019, 17 Questions and Answers

Angular 6 Interview Questions and answers

Looking for a new job? Do not miss to read our Angular 6 Interview Questions and answers. Whether you are a fresher or an experienced, these questions and answers that can help you to crack your interview.

Angular is an advance JavaScript framework used to used to build both apps and web applications in HTML, JavaScript, and TypeScript. This faster, more comfortable and lighter version of Angular has many features compared to the previous release. The code written here is TypeScript, which compiles with JavaScript and displays the same in the browser.

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Angular 6 is almost the same as its previous version, but with few improvements. Projects developed in Angular 5 will easily support Angular 6.

Few of the crucial features that have been added to the newest version are:
  • The support for TypeScript 2.7+
  • Addition of elements
  • Component Development Kit with stable Angular material
  • Bazel compiler
  • Ivy renderer
  • Addition of restoredState and navigationSource to NavigationStart
  • NgModelChange event
  • Addition of multiple validators for FormBuilder’s array method
  • CLI 1.7 support and its feature addition
  • Update for ng
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In Angular, feature modules are NgModules, used for the organizational best practice of code management. It delivers a cohesive set of functionality that is specific application focused.

There are five types of feature modules:
  • Routed feature modules
  • Domain feature modules
  • Routing modules
  • Widget feature modules
  • Service feature modules
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Ivy is the next generation and advances Angular Renderer released along with Angular 6. This rendering pipeline is smaller, faster and simpler to use.

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The Bazel and Closure compiler is the newest feature added to Angular 6. The tool can be used by developers to optimize their Angular applications better. Here, Bazel will rebuild the necessary while the smaller bundles will be generated by the Closure.

Here are some more Angular 6 interview questions that we have specially designed for the experienced and freshers as well.

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In Angular, the TemplateRef represents an embedded template which can be used to instantiate embedded.


The ViewContainerRef represents a container where one or multiple views can be attached.

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The FormGroup has the role in tracking validity state and value of a group of FormControl.


In Angular, FormControl is used by developers to track validation and values of a form of control. This can be both used as standalone as well as with the parent form. FormControlName and FormControlDirective directives are used when we work with FormControl class.

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S.no Promise Observable
1. In Angular, A Promise operates a single event when an async operation fails or completes The Observable allows passing zero or more events where the callback is received for each event.
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The Traceur compiler takes ES6 or ECMAScript Edition 6 which includes generators, classes, generators, etc. and compiles it down to regular JavaScript that runs smoothly with your browser.

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NgZone is used by developers to start change detection resulted by async operations automatically. It gives us back control of our code’s execution. It can be used to subscribe to an Observable that is present outside of the angular zone and also to return to the angular zone when reacting to the same Observable.

NgZone Service has always been a fantastic Angular 6 Interview Questions for both freshers and experienced as well.

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S.no Angular service Factory
1. Angular service is a function dedicated to the business layer of the application. It worked as a constructor function and invoked at runtime with new. Public methods can be added to it. The factory is a design pattern to create objects, return functions and closures, return Object literals, return a simply String and more.
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DI or Dependency Injection software design pattern which deals how components hold of their dependencies. The AngularJS injector is a subsystem present in it to create components, resolve their dependencies and also to provide them to other components if requested.

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These are Angular components that carry the minified version of the whole framework. Angular elements also allow users to create custom elements in a framework-agnostic way. These elements can be used in simple web projects but with powerful features of ANgualr within.

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The zone is a set of programs or API used by Angular 6 update the application view when any change occurred. It’s an execution context that persists cross asynchronous tasks.

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S.no Constructor ngOnInit
1. The Constructor is a default method of the class executed when the class is instantiated and makes sure proper field initialization in the classes and subclasses. In Angular 6, ngOnInit is a life cycle hook used to by the program to indicate that the component is successfully created by the Angular.
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Every npm package contains a file in the project root, which is package.json. The project related various metadata is stored inside it. The package.json file is used to share information to npm that allows it to identify the project and hand its dependencies. This file can also contain other metadata of project such as license information, configuration data, project description, project version, etc. which are crucial for both for the end users of the package as well as npm.

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