Merce Technologies Angular Frontend Developer Interview Questions, Process, and Tips

To call an API in Angular, use HttpClient module to make HTTP requests.

• Import HttpClientModule in app.module.ts

• Inject HttpClient in the component/service where API call needs to be made

• Use HttpClient methods like get(), post(), put(), delete() to make API calls

• Subscribe to the Observable returned by HttpClient methods to handle the response

Reactive forms are more flexible and allow for complex form validation and handling, while template driven forms are simpler and rely on directives in the template.

• Reactive forms are defined programmatically in the component class using form controls, form groups, and form arrays.

• Template driven forms are defined in the HTML template using ngModel directive and template variables.

• Reactive forms offer more control over ...read more

Reactive forms in Angular allow for creating and managing forms in a reactive way.

• Import ReactiveFormsModule in app.module.ts

• Create form controls using FormBuilder in component

• Bind form controls to HTML elements using formGroup and formControlName directives

• Handle form submission and validation using formGroup and formControl directives

You can pass data through routing by using route parameters or query parameters.

• Use route parameters to pass data directly in the URL, like '/page/:id'

• Access the passed data in the target component using ActivatedRoute

• Use query parameters for passing data in the URL, like '/page?id=123'

• Retrieve query parameters in the target component using ActivatedRoute

Angular 17 introduces new features such as improved performance, enhanced tooling, and updated APIs.

• Improved performance with faster rendering and reduced bundle sizes

• Enhanced tooling with better support for debugging and testing

• Updated APIs for more efficient development and easier integration with other libraries