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Technical interview questions and answers.
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Explore 572 interview questions and answers across 11 technical and behavioral topics, including Angular, React, system design, and testing. Search by skill, choose a difficulty, then answer in your own words and compare with the sample.

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Showing 572 practice prompts

✦

ANGULAR

Basic

What is Angular and how does it differ from AngularJS?

Angular (versions 2+) is a complete TypeScript-based rewrite of AngularJS (1.x). While AngularJS used two-way data binding with $scope and controller architecture, modern Angular uses a component-based architecture, unidirectional data flow, hierarchical dependency injection, Ahead-of-Time (AOT) compilation, and modern reactive primitives like Signals and RxJS.
◦ core
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ANGULAR

Basic

What is a Component in Angular?

A Component is the fundamental building block of an Angular user interface. It consists of a TypeScript class decorated with @Component({ selector, templateUrl/template, styleUrls/styles, standalone }), an HTML template, CSS styling, and component logic managing user interaction and data presentation.
◦ core
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ANGULAR

Basic

What are Angular Directives and what types exist?

Directives add behavior or transform DOM elements. There are three types: 1) Component Directives (directives with templates), 2) Structural Directives (alter DOM layout by adding/removing elements, historically *ngIf, *ngFor, or modern @if, @for control flow), and 3) Attribute Directives (modify the appearance or behavior of an existing element, e.g., ngClass, ngStyle, or custom directives).
◦ core
✦

ANGULAR

Basic

What are Pipes in Angular and how are they used?

Pipes are functions in template expressions that transform input data for display without modifying the underlying model. Angular provides built-in pipes such as date, uppercase, lowercase, currency, percent, json, and async. Custom pipes are created using the @Pipe decorator with the PipeTransform interface.
◦ core
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ANGULAR

Basic

What is Data Binding and what binding mechanisms exist in Angular templates?

Data binding synchronizes data between the TypeScript component and its HTML template. Modern Angular supports: 1) Interpolation {{ value }}, 2) Property binding [property]="value", 3) Event binding (event)="handler($event)", and 4) Two-way binding [(ngModel)]="value" (via FormsModule).
◦ core
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