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Angular interview questions

Angular interview questions.

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1.

What is a module, and what does it contain?

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2.

What are pipes? Give me an example.

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3.

What is Routing Guard in Angular?

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4.

How would you run unit test?

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5.

What is the equivalent of "ngShow" and "ngHide" in Angular?

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6.

What is the difference between "@Component" and "@Directive" in Angular?

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7.

What is a bootstrapping module?

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8.

What is the minimum definition of a component?

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9.

What is a component? Why would you use it?

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10.

What are the differences between AngularJS (angular 1.x) and Angular (Angular 2.x and beyond)?

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11.

What is interpolation?

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12.

What is the equivalent of ngShow and ngHide in Angular?

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13.

What is the difference between *ngIf vs hidden?

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14.

What are observables?

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15.

What is the difference between Structural and Attribute directives in Angular?

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16.

What is a service, and when will you use it?

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17.

What are some differences between Angular 2 and 4?

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18.

What's the difference between an Angular component and module?

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19.

How would you protect a component being activated through the router?

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20.

You have an HTML response I want to display. How do I do that?

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21.

What is an observer?

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22.

What is an observable?

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23.

What is the purpose of base href tag?

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24.

What does this line do?

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25.

How can I select an element in a component template?

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26.

How do you categorize data binding types?

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27.

What is the purpose of Wildcard route?

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28.

When would you use eager module loading?

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29.

How to inject base href?

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30.

How do you perform error handling in observables?

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31.

Explain how custom elements works internally?

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32.

What are custom elements?

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33.

What are dynamic components?

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34.

What is the option to choose between inline and external template file?

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35.

Why should ngOnInit be used, if we already have a constructor?

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36.

What is multicasting?

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37.

How do you perform Error handling for HttpClient?

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38.

What is the difference between @Component and @Directive in Angular?

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39.

What is difference between "declarations", "providers" and "import" in NgModule?

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40.

What is the use of codelyzer?

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41.

What is the difference between promise and observable?

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42.

Angular 8: What is Angular Ivy?

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43.

Explain the difference between Promise and Observable in Angular?

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44.

What is Reactive Programming and how to use one with Angular?

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45.

What's new in Angular 6 and why shall we upgrade to it?

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46.

What is Protractor?

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47.

What is subscribing?

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48.

What is router outlet?

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49.

What is router state?

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50.

What is Angular Universal?

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51.

Angular 8: What is Bazel?

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52.

Why would you use a spy in a test?

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53.

Why Incremental DOM Has Low Memory Footprint?

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54.

What happens if you use script tag inside template?

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55.

What is the point of calling "renderer.invokeElementMethod(rendererEl, methodName)"?

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56.

What is Redux and how does it relate to an Angular app?

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57.

What is AOT?

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58.

Can you explain the difference between Promise and Observable in Angular? In what scenario can we use each case?

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59.

What's new in Angular 8?

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60.

Explain the difference between "Constructor" and "ngOnInit"

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61.

What are the utility functions provided by RxJS?

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62.

What is activated route?

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63.

Do I need a Routing Module always?

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64.

What is a parameterized pipe?

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65.

What is TestBed?

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66.

What are the ways to control AOT compilation?

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67.

What are the Core Dependencies of Angular 7?

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68.

Angular 8: Explain Lazy Loading in Angular 8?

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69.

How to bundle an Angular app for production?

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70.

How would you control size of an element on resize of the window in a component?

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71.

What is Zone in Angular?

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72.

When should I store the "Subscription" instances and invoke unsubscribe() during the NgOnDestroy life cycle and when can I simply ignore them?

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73.

How do you create application to use scss? What changed for Angular 6?

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74.

How would you insert an embedded view from a prepared TemplateRef?

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75.

Why do we need compilation process?

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76.

Explain the purpose of Service Workers in Angular

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77.

What is the need for SystemJS in Angular?

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78.

What is Reactive programming and how does it relate to Angular?

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79.

Are there any pros/cons (especially performance-wise) in using local storage to replace cookie functionality?

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80.

What is Ivy Renderer? Is it supported by Angular 7?

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81.

What are the lifecycle hooks for components and directives?

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82.

What would be a good use for NgZone service?

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83.

What is the difference between pure and impure pipe?

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84.

What is incremental DOM? How is it different from virtual DOM?

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85.

How to detect a route change in Angular?

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86.

Name some security best practices in Angular

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87.

What are the advantages with AOT?

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88.

Angular 8: Why we should use Bazel for Angular builds?

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89.

Name and explain some Angular Module Loading examples

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90.

What does "detectChanges" do in Angular jasmine tests?

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91.

What are the mapping rules between Angular component and custom element?

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92.

Do I need to bootstrap custom elements?

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93.

When does a lazy loaded module is loaded?

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94.

What does a just-in-time (JIT) compiler do (in general)?

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95.

Why would you use lazy loading modules in Angular app?

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96.

Why would you use renderer methods instead of using native element methods?

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97.

What is ngUpgrage?

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98.

Angular 9: What are some new features in Angular 9?

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99.

What are observable creation functions?

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100.

When to use query parameters versus matrix parameters?

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101.

What's new in Angular 7?

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102.

Name some differences between SystemJS vs WebPack?

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103.

Why did the Google team go with incremental DOM instead of virtual DOM?

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104.

What is the difference between BehaviorSubject vs Observable?

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105.

Is there no equivalent to $scope.emit() or $scope.broadcast() in Angular?

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106.

Angular 9: How Would You Compare View Engine vs Ivy?

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107.

Why Incremental DOM is Tree Shakable?

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108.

Why angular uses url segment?

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109.

Just-in-Time (JiT) vs Ahead-of-Time (AoT) compilation. Explain the difference.

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110.

Angular 9: What is Locality principle for Ivy?

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111.

What is the default compilation for Angular 5?

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112.

Do you know how you can run angularJS and angular side by side?

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113.

Could you provide some particular examples of using ngZone?

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114.

How would you extract webpack config from angular cli project?

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115.

Angular 8: How does Ivy affect the (Re)build time?

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116.

Angular 8: What are some changes in Location module?

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117.

Angular 9: Explain improvements in Tree-Shaking

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118.

Could I use jQuery with Angular?

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119.

How to set headers for every request in Angular?

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120.

What is the Angular equivalent to an AngularJS "$watch"?

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Reverse Tech Interview: Questions to Stump an Interviewer

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11 Reactive Systems interview questions and answers for software engineers

Reactive systems are an architectural style that allows multiple individual applications to blend into one unit, reacting to their environment, while staying aware of each other. Here is a list of coding interview questions on Reactive Systems to help you get ready for your next data struc...

. Reactive Systems
34 Microservices interview questions and answers for software engineers

Microservice architecture – a variant of the service-oriented architecture structural style – arranges an application as a collection of loosely coupled services. In a microservices architecture, services are fine-grained and the protocols are lightweight. Here is a list of coding intervie...

. Microservices
7 Layering & Middleware interview questions for developers

Middleware in the context of distributed applications is software that provides services beyond those provided by the operating system to enable the various components of a distributed system to communicate and manage data. Middleware supports and simplifies complex distributed application...

. Layering & Middleware
55 Docker interview questions and answers for software engineers

Docker is a set of platform as a service products that use OS-level virtualization to deliver software in packages called containers. Here is a list of coding interview questions on Docker to help you get ready for your next data structures interview in 2021.

. Docker
23 Databases interview questions and answers for software engineers

A database is an organized collection of data, generally stored and accessed electronically from a computer system. Where databases are more complex they are often developed using formal design and modeling techniques. Here is a list of coding interview questions on Databases to help you g...

. Databases
21 Concurrency interview questions and answers for software engineers

In computer science, concurrency is the ability of different parts or units of a program, algorithm, or problem to be executed out-of-order or in partial order, without affecting the final outcome. Here is a list of coding interview questions on Concurrency to help you get ready for your n...

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13 CAP Theorem interview questions and answers for software engineers

In theoretical computer science, the CAP theorem, also named Brewer's theorem after computer scientist Eric Brewer, states that it is impossible for a distributed data store to simultaneously provide more than two out of the following three guarantees: Consistency: Every read receives the ...

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