Angular 6 Interview Questions and Answers
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 is an essential topic in Angular 6 Interview Questions for experienced professionals and freshers. This feature will allow the developers to render their Angular elements as essential web elements and will be looked upon as trusted HTML elements.
- Bazel compiler
- Ivy renderer
- Addition of elements
- Component Development Kit with stable Angular material
- The support for TypeScript 2.7+
- NgModelChange event
- Addition of multiple validators for FormBuilder’s array method
- CLI 1.7 support and its feature addition
- Update for ng
| Quick Facts About Angular 6 | |
|---|---|
| What is the latest version of Angular? | Angular 11.0 released on 11th November 2020 |
| When did angular 6 release? | 4th May 2018 |
| Who is the developer of Angular 6? | |
| When was Angular first released? | Angular 2.0 and released on 14th September 2016 |
| License | MIT License |
| What language does Angular use? | TypeScript |
Most Frequently Asked Angular 6 Interview Questions
A template expression produces a value in Angular within double curly braces {{ }}. It executes the expression and assigns it to a property of the particular binding and the target can be an HTML element, a component, or a directive.
In terms of syntax, it is much similar to that of Javascript. Most of the JavaScript expressions are legal template expressions, with a few exceptions.
You can't use JavaScript expressions that have or promote side effects, including:
Assignments (=, +=, -=, ...)
Operators like new, typeof, instanceof, etc.
Chaining expressions with ; or ,
With increment and decrement operators ++ and --
Most of the ES2015+ operators
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
In Angular Material, Flex is a layout which basically is a component engine allowing you to easily create Flexbox-based page layouts with a specific set of directives available for your template. In addition, Flex eradicates the need for a separate style sheet.
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 Top Angularjs 6 interview questions that we have specially designed for the experienced and freshers as well.
FormGroup
The FormGroup has the role in tracking validity state and value of a group of FormControl.
FormControl
In Angular, FormControl is used by developers to track the 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.
Decorators are actually just functions that are called as per the component they are handling. A class decorator shall be called with the class being decorated and similarly for a method decorator. Here’s how to create a decorator in Angular 6:
Step 1:
function Console(target) {
console.log('Our decorated class', target);
}
Step 2:
@Console
class ExampleClass {
constructor() {
console.log('Hello!');
}
}
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.
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.
| 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. |
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.
Angular 6 Interview questions are always a level up and thus a little tough to crack. 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.
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. If you are scrolling on the web for angular 6 interview questions and answers pdf, then this guide will gonna help you.