Modules — Angular Technical Interview Questions & Answers

Modules

Modules

  • NgModule groups declarations and imports. AppModule (or app.config standalone) boots the app. Feature module MarksModule holds marks pages so AppModule stays small.
  • declarations: components of this module. imports: other modules you need (CommonModule for *ngIf). exports: what other modules may use.
  • Standalone components skip NgModule. Still import CommonModule / RouterLink in the component imports array. Trap: declaring a component in two modules.

Technical Interview Tip: declarations vs imports vs exports. Standalone alternative.

Code Examples for Modules

Modules — working example

import { Component } from "@angular/core";

@Component({
  selector: "app-root",
  template: `
    <h1>{{ title }}</h1>
    <button (click)="toggle()">Toggle</button>
    <p *ngIf="open">Panel open</p>
  `,
})
export class AppComponent {
  title = "Angular practice";
  open = true;
  toggle() {
    this.open = !this.open;
  }
}

Modules: toggle open. Say whether the panel is on screen after one click.

How to Explain Modules to an Interviewer

What goes in declarations vs imports?

Your components Other modules / standalone deps