Angular 5 Interview Questions

Decorators are functions that adds metadata to class members and functions. It was proposed in ES2016 and implemented in Typescript.

 In Angular component life cycle in Angular goes through the following stages.

• Create
• Render
• Create and render children
• Check for bound data changes and re-render
• Destroy

*ngFor directive is used for Iterating over a list of items and for Generating a new DOM element for each one.

AngularJS reads the HTML and compiles it into an internal representation, this reading and compiling is called bootstrapping.

When you write the code to execute the bootstrapping instead of using ng-app directive then it is called manual bootstrapping.

After installing Angular CLI run ng new project-name command to create a new Angular project.

Transpiling is a process of converting code from one language to another. In Angular, Traceur compiler is used for converting TypeScript to JavaScript so that browsers can understand.

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Angular CLI is Command Line Interface for Angular that runs Webpack.You can use npm install -g @angular/cli command to install angular CLI.

Angular5 component is made of a Component decorator and a component definition of a class. ng generate component component_name command is used to generate a component in Angular5.

ng serve command is used to run Angular5 application locally during development. To start development server on specific port ng serve -p aPortNumber command is used.

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In Angular5 $event is a reserved keyword that represents the data emitted by an event (event data).It is commonly used as a parameter for event based methods.

 NPM stands for node package manager. It is used for installing dependencies for javascript packages.

Angular 5 supports four types of Data Binding They are

• String Interpolation
• Property Binding
• Event Binding
• Two-way-binding

Webpack is module bundler Bundler for Angular2 or above. It bundles, minifies and transpiles an Angular application.