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The interview questions below are grouped by category and each category lists questions in easy-to-hard order.

Interviews should ask the candidate to self-assess their skills/experience. Based on the candidate's response, the interviewer can jump to the appropriate section.

Some basic questions going from easy to difficult. A more exhaustive list of more questions from the community can be found here.

General

• What is variable shadowing
• What are the 3 big wins with ES6 (over ES5)

Possible answers: fat arrow, template string, modules, classes, default params, implicit accessors/mutators, let, desconstruction

• ES6 Module,
• what can it contain
• how do you publish for external use
• how do you protect for internal use
• What is a spread operator (aka desconstruction operator)
• What’s the difference between a promise and Observable?
• Are Observables always asynchronous ?
• What are two (2) important things provided by the async pipe?
• What is a barrel used for?

Typescript

• What is a Generic in Typescript
• Give me an example of strongly typed function
• Bonus: strongly typed function that returns observable
• Bonus: strongly typed function that uses HttpClient
• What does forwardRef do

Angular

• What is the difference between an ES6 module and an ngModule
• How do you get a reference to a child component
• What is Dependency Injection
• What is @Injectable used for ?
• What is @Inject used for ?
• What are pipes
• How do you use component that defined/implemented in another module?
• What is router-outlet?
• What is the Angular Compiler and how is it used
• What is the difference between AOT and JIT?
• What is AOT

Angular Components

• What is a component in Angular
• What are differences between Components and Directives
• How do we create a Angular Component (hint what decorator)
• Give me 3 component lifecycle events
• Why is ngOnInit() important
• Explain content projection
• What is a difference between @ViewChild and @ContentChild
• How do you listen for events in a component?
• What is OnPush change detection in components
• What is the difference between template and reactive forms and why would you use one or the other
• What is ViewEncapsulation
• What is ng-container and why is it useful?
• What are entryComponents

Advanced

• What is the difference between Template-Driven and Reactive forms
• What is a Guard
• What is a Resolver
• What is a Zone
• Why are ngZones important

RxJS

• Explain Observables and why they are useful.
• Are Observables asynchronous
• Why is the Async pipe useful
• What are pipeable operators

Redux / Ngrx

• What is Redux pattern and explain why its useful.
• What is the difference between Redux and Ngrx
• What is the aspect of Ngrx you like the most
• Why are Effects important in ngrx