Q: What is the role of NG_VALUE_ACCESSOR in a custom component?

**Target Audience:** Developers who have copied the NG_VALUE_ACCESSOR provider into a component and want to understand each part of it. **Difficulty:** Medium > **How to read this doc:** Plain language first, then 📌 Interview term: callouts. Every error message below was produced on Angular 22.2.3 by booting a deliberately broken component (compiled with ngc in strict mode, run in jsdom); the selection rules were confirmed in the @angular/forms</cod

Q: What are ng-container and ng-template?

**Target Audience:** Developers who have seen ng-container and ng-template in templates and want a precise picture of what each does and what ends up in the DOM. **Difficulty:** Easy to Medium > **How to read this doc:** Plain language first, then 📌 Interview term: callouts. The DOM markup quoted below is the real innerHTML printed after compiling the templates with ngc (strict templates) on Angular 22.2.3 and running them in jsd

Question 1

Explain the new Control Flow (@if, @for, @switch) and how it compares to structural directives.

Accepted Answer

**Target Audience:** Developers who know basic Angular templates and want to understand what replaced *ngIf and *ngFor, and why. **Difficulty:** Medium > **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. Every rendered output, compiler message and compiled instruction quoted below was produced on Angular 22.2.3: the examples were AOT-compiled wi

Question 2

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 3

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 4

What is the role of NG_VALUE_ACCESSOR in a custom component?

Accepted Answer

**Target Audience:** Developers who have copied the NG_VALUE_ACCESSOR provider into a component and want to understand each part of it. **Difficulty:** Medium > **How to read this doc:** Plain language first, then 📌 Interview term: callouts. Every error message below was produced on Angular 22.2.3 by booting a deliberately broken component (compiled with ngc in strict mode, run in jsdom); the selection rules were confirmed in the @angular/forms

Question 5

What is a directive and what are the types?

Accepted Answer

**Target Audience:** Developers who use components daily and want a clear map of Angular's directive types, and how to write their own. **Difficulty:** Easy to Medium > **How to read this doc:** Plain language first, then 📌 Interview term: callouts. The rendered output and event behaviour below were produced on Angular 22.2.3 by compiling the example with ngc (strict templates) and driving it in jsdom; the compiled definitions were read from ngc output an

Question 6

What are ng-container and ng-template?

Accepted Answer

**Target Audience:** Developers who have seen ng-container and ng-template in templates and want a precise picture of what each does and what ends up in the DOM. **Difficulty:** Easy to Medium > **How to read this doc:** Plain language first, then 📌 Interview term: callouts. The DOM markup quoted below is the real innerHTML printed after compiling the templates with ngc (strict templates) on Angular 22.2.3 and running them in jsd

Question 7

How does the new control flow @if / @for / @switch replace *ngIf and *ngFor?

Accepted Answer

**Target Audience:** Developers maintaining an Angular codebase that still uses *ngIf, *ngFor and ngSwitch, and anyone asked "how would you migrate this?" in an interview. **Difficulty:** Medium > **How to read this doc:** Plain language first, then 📌 Interview term: callouts with the vocabulary an interviewer expects. Everything quoted below was produced on Angular 22.2.3: both examples were AOT-compiled with strict templates and run in jsdo

Question 8

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

Accepted Answer

**Target Audience:** Angular developers who know components and want to cut the initial bundle without restructuring routes. **Difficulty:** Medium > **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 runnable example was compiled with ngc (strict templates) and also run in playground mode on Angular 22.2.3, then clicked by a script; the error-state and c

Question 9

How do you build a custom form control by implementing the ControlValueAccessor interface?

Accepted Answer

**Target Audience:** Developers comfortable with reactive forms who need a custom widget to act like a native input. **Difficulty:** Medium to Hard > **How to read this doc:** Plain language first, then 📌 Interview term: callouts. The call orders in sections 5 and 6 were logged by the components themselves on Angular 22.2.3, compiled with ngc in strict mode and booted in jsdom; the runnable example printed the same lines in playground mode. ## 1. Why This Even Matter

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