Q: What is the difference between @ViewChildren and @ViewChild?

**Target Audience:** Developers who know @ViewChild and need to work with a list of matches: several inputs, a @for of child components, a set of tabs. **Difficulty:** Medium > **How to read this doc:** Plain language first, then 📌 Interview term: callouts. Every "Verified" block was compiled with ngc (strict templates) on Angular 22.2.3 and run; compiled output was read from ngc itself. ## 1. Why This Even Matters — A Story Fir

Question 1

What are components and modules in Angular?

Accepted Answer

**Target Audience:** Anyone preparing for an Angular interview — assumes basic TypeScript classes, no Angular required. **Difficulty:** Easy > **How to read this doc:** Plain language first, then 📌 Interview term: callouts with the vocabulary an interviewer expects. Every output and error message quoted below was produced by compiling the code with ngc (strict templates) on Angular 22.2.3 and running it. ## 1. Why This Even Matters — A Story First Think of a restaur

Question 2

What is Angular and how does it differ from AngularJS?

Accepted Answer

**Target Audience:** Anyone preparing for an Angular interview — assumes basic JavaScript, no Angular or AngularJS required. **Difficulty:** Easy > **How to read this doc:** Ideas are explained in plain language first, then tagged with 📌 Interview term: so you also learn the words an interviewer listens for. The output in section 5 was produced by compiling and running the example on Angular 22.2.3, and the default-behaviour claims in section 6 were read from the Angular 22.2.3 pa

Question 3

How do child components emit events to parents?

Accepted Answer

**Target Audience:** Anyone preparing for an Angular interview who knows what a component and an input are. **Difficulty:** Easy > **How to read this doc:** Plain language first, then 📌 Interview term: callouts. The call order in section 4 and the bubbling test in section 5 were produced by compiling the examples with ngc on Angular 22.2.3 and clicking through them in jsdom. ## 1. Why This Even Matters — A Story First A child at a school play does not walk into the

Question 4

What does the Angular CLI provide?

Accepted Answer

**Target Audience:** Anyone preparing for an Angular interview — no Angular experience needed. **Difficulty:** Easy > **How to read this doc:** Plain language first, then 📌 Interview term: callouts. Everything under "Verified" was produced by running Angular CLI 22.2.3 in a sandbox: ng new, ng generate --dry-run, ng serve, ng build, ng test and ng lint, with the real output quoted. ng add an

Question 5

What are standalone components?

Accepted Answer

**Target Audience:** Developers preparing for an Angular interview who know what a component is and have seen, or heard of, NgModules. **Difficulty:** Easy > **How to read this doc:** Plain language first, then 📌 Interview term: callouts. Everything under a "Verified" heading was compiled with ngc on Angular 22.2.3 and run; the lazy-loading log in section 5 came from a real provideRouter setup. ## 1. Why This Even Matters — A Story First Picture packing

Question 6

What is the fixture.detectChanges() method in Angular testing, and when should you call it?

Accepted Answer

**Target Audience:** Developers writing or reviewing Angular component tests; assumes you have seen a TestBed spec but not much more. **Difficulty:** Easy to Medium > **How to read this doc:** Plain language first, then 📌 Interview term: callouts with the vocabulary an interviewer listens for. Every behaviour quoted below was produced by running the spec in the example with Angular CLI 22.2.3 (ng test --watch=false, Vitest + jsdom), in the default zoneles

Question 7

What is the difference between @ViewChildren and @ViewChild?

Accepted Answer

**Target Audience:** Developers who know @ViewChild and need to work with a list of matches: several inputs, a @for of child components, a set of tabs. **Difficulty:** Medium > **How to read this doc:** Plain language first, then 📌 Interview term: callouts. Every "Verified" block was compiled with ngc (strict templates) on Angular 22.2.3 and run; compiled output was read from ngc itself. ## 1. Why This Even Matters — A Story Fir

Question 8

Explain how to perform unit testing on components with Signals using TestBed.

Accepted Answer

**Target Audience:** Developers moving component tests from @Input()/@Output() to the signal APIs (input(), model(), output(), computed(), effect()). **Difficulty:** Medium > **How to read this doc:** Plain language first, then 📌 Interview term: callouts. All results were produced by running the example spec with Angular CLI 22.2.3 (ng test --watch=false, Vitest, the default zon

Question 9

What is standard content projection vs. Multi-Slot Content Projection?

Accepted Answer

**Target Audience:** Developers who already use and need to build components with several distinct content areas, such as cards, dialogs and page layouts. **Difficulty:** Medium > **How to read this doc:** Plain language first, then 📌 Interview term: callouts. Every slot assignment quoted below was produced on Angular 22.2.3 by compiling the components with ngc (strict templates), rendering them in jsdom, and printing what landed in eac

Question 10

What are Angular lifecycle hooks?

Accepted Answer

**Target Audience:** Developers preparing for an Angular interview who know what a component is and want the hook order down cold, including how a parent and its child interleave. **Difficulty:** Easy to Medium > **How to read this doc:** Plain language first, then 📌 Interview term: callouts. Every ordering claim below comes from a parent and child that log each hook, compiled with ngc on Angular 22.2.3 and run; the numbered lists are the real output. ## 1. Why This

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Easy

What are components and modules in Angular?

What is Angular and how does it differ from AngularJS?

How do child components emit events to parents?

What does the Angular CLI provide?

What are standalone components?

What is the fixture.detectChanges() method in Angular testing, and when should you call it?

Medium

What is the difference between @ViewChildren and @ViewChild?

Explain how to perform unit testing on components with Signals using TestBed.

What is standard content projection vs. Multi-Slot Content Projection?

What are Angular lifecycle hooks?

What is the role of NgRx Effects, and why do we separate side effects from reducers?

What is a directive and what are the types?

What are @ViewChild and @ContentChild?

What is ComponentFixtureAutoDetect and how does it affect unit tests?

Hard

What is the difference between AOT and JIT compilation?

What are Deferrable Views (@defer) and how do they work in Angular 17+?

What are signal inputs and model() in modern Angular?

Signals signal()/computed()/effect() vs RxJS — when do you use which in Angular 18+?

How does change detection work in Angular?

What is the difference between ElementRef, TemplateRef, and ViewContainerRef?

What is ViewEncapsulation in Angular?

How do you dynamically create components?