Angular Interview Questions

          • 1 What is AngularJS?

          • 2 What is Angular and what are the various versions of Angular?

          • 3 Why was version 3 skipped?

          • 4 Why we need Angular?

          • 5 What is the problem in Angular JS so we are using Angular?

          • 6 Which language we can use with Angular for Component creation?

          • 7 What is need of TypeScript in Angular?

          • 8 Can I use another language except TypeScript for Angular?

          • 9 What is Angular CLI?

          • 10 Why we are using Angular CLI while we have another method for Angular application creation?

          • 11 What is the difference between various version of Angular?

          • 12 What are the prerequisites for Angular?

          • 13 How can we check the version of Angular?

          • 14 What are the best IDE for Angular?

          • 15 How can we run two Angular project simultaneously?

       • 16 What is bootstrapping in Angular? Is it possible to start Angular in any other way rather than appmodule? If yes then how?

          • 17 How does an Angular application get start?

          • 18 What is the Architecture Overview of Angular?

          • 19 What is webpack?

       • 20 We cannot reload our Angular application after changing in code It automatically changes this code How?

          • 21 Which files bundled and injected in indexhtml at runtime by webpack?

          • 22 Can we create the Angular application without Angular CLI ?

          • 23 What is npm and what is the need for Angular application?

          • 24 How Webpack is different than SystemJS?

          • 25 What is the difference between AOT and JIT?

          • 26 What is transpilation concept of Angular?

          • 27 Can we add more than one component in bootstrap in @NgModule?

          Command based

          • 28 How can we run our Angular project? Which is the default port used by Angular?

          • 29 What is the difference between ng serve and ng serve –open?

          • 30 CLI Commands

          Folder Structure

          • 31 What is the purpose of maints file?

          • 32 What is the role of packagejson file?

          • 33 How packagejson file different from package-lockjson file?

          • 34 What is the role of tsconfigjson file?

          • 35 What is the role of Angular-clijson file?

          • 36 What is the use of “assets” folder in Angular?

          Data Binding

          • 37 What is data binding in Angular?

          • 38 How many types of binding supported by Angular?

          • 39 What is Interpolation? Give an example

          • 40 What is Property binding? Where you can implement property binding?

          • 41 How many ways you can achieve property binding? What is the benefit of using property binding?

          • 42 When we used the Property binding and when we use Interpolation?

          • 43 What is Class binding? Give an example

          • 44 What is Style binding? Give an example

          • 45 What is Attribute binding? What is the benefit of using it

          • 46 What is Event binding? Give an example

          • 47 Where you can implement event binding?

          • 48 Name some common events that you can use for event binding?

          • 49 What is Two way binding? Give an example

          • 50 What is template reference variable?

          • 51 How many ways we can create template reference variable?

          • 52 Can we use template reference variable using select (combo box) If yes, then how?

          • 53 How Angular ensure about content security at the time of binding?

          • 54 What is ngModel? or What is the role of ngModel?

          • 55 Which binding we will use for dynamic css?

          Components

          • 56 What is component in Angular ?

          • 57 How can we create a component?

          • 58 Component is directive or not?

          • 59 What is component decorator?

          • 60 What are the different properties of a component object?

          • 61 What is the mandatory property of @Component() decorator function?

          • 62 What is ViewEncapsulation?

          • 63 What is changeDetection Property?

          • 64 What is the difference between templeteUrl and template?

          • 65 What is the difference between styleUrl and style?

         •66 What is the difference between providers present in component and present in appmodulets file?

          • 67 What is Dynamic Component?

          • 68 What is the use of ComponentFactoryResolver Service?

          • 69 Give an example of Dynamic Component?

          • 70 What is nested component?

          • 71 What is the role of selector?

          • 72 What is entry Component?

          • 73 What is component hook lifecycle?

          • 74 If there is nested component (parent and child) then order of lifecycle hook is same or different?

          • 75 What is the difference between @ViewChild and @ViewChildren?

          • 76 What is the difference between @ContentChild and @ContentChildren?

          • 77 What is the difference between ngDoCheck and ngOnChange?

          • 78 How can we pass data from component to component?

          • 79 How can we pass data from parent component to child component using @Input

          • 80 How can we pass data from child component to parent component using @Output

          • 81 What is Event Emitter?

          Directives

          • 82What is directives?

          • 83 How many types of directives supported by Angular?

          • 84 What is @Directive decorator?

          • 85 Can we create constructor in our directive If yes then how

          • 86 What is Component directive Give an example

          • 87 What is structural directive

          • 88 Name some structural directives provided by Angular

          • 89 What is the difference between ngIf and hidden?

          • 90 How can we use “then” and “else” keywords with *ngIf directive? Explain with an example

          • 91 What are the keywords that we used at the time of ngSwitchCase and what is the role of that keywords?

          • 92 What is *ngFor ? and what are the exported values of ngFor directive?

          • 93 What is the difference between ngFor and ngForOf?

          • 94 Why “*” is prefix with structural directive? Can we use structural directive without using *?

          • 95 How many structural directives can we implement on a single element?

          • 96 How can list items be tracked by default?

          • 97 Can we provide our own mechanism for tracking the elements? If yes, then how?

          • 98 What are attribute directives? Give an example

          • 99 What is the difference between attribute directive and component directive?

          • 100 What is ng-template?

          • 101 What is Host Listner

          Pipes

          • 104 What is pipes and how we can use in Angular ?

          • 105 Name some built-in pipe provided by the Angular

          • 106 Can I create custom pipe in Angular?

          • 107 What is Chaining pipe?

          • 108 What is @Pipe Decorator?

          • 109 How many types of Pipes support by Angular?

          • 110 How can you define or set your pipe as pure or impure?

          • 111 Can I create any pipe in Angular if yes then How?

          • 112 What is an AsyncPipe in Angular?

          Services

          • 113 What is services?

          • 114 HTTP Services?

          • 115 What are the different HTTP Verbs supported by Angular

          • 116 What are the difference between Patch() and Put()?

          • 117 Why we are using services for transfer the data while we have @Input and @Output?

          • 118 How we can send the value from one component to another component using service and their has not relation of parent and child?

          • 119 What is providers?

          • 120 What is Dependency Injection (DI) ?

          • 121 Explain about @Injectable?

          • 122 How many services we can add into Providers ?

          • 123 If we have imported the service in the appmodulets and then using the service then it will give error or run successfully IF error then which type of error?

          • 124 How many decorator has in Angular ?

          • 125 What is backtick and how we are using in Angular?

          • 126 What is DOM Shadowing ?

          • 127 If we send any number value from child to parent component then the emitter will number or string?

          Dependency injection

          • 128 What is Dependency Injection?

          • 129 What is RXJS?

          • 130 What is the difference between promises and observable ?

          • 131 What is subscribers ?

          • 132 How we can handle the error in Angular?

          Routing

          • 133 What is Routing in Angular?

          • 134 How can you define routing in Angular?

          • 135 What is a RouterOutlet?

          • 136 What is Router links?

          • 137 What is Router State?

          • 138 What are Router events?

          • 139 What is Wildcard route?

          • 140 What is pathMatch property in routing?

          • 141 How can we pass parameter in Routing?

          • 142 What are the guard interfaces supported by router?

          • 143 Difference between [routerLink] and routerLink?

          Form

          • 144 What is Form and how many strategies we have for develop the form

          • 145 What is Template driven and reactive form and why we are using in Angular?

          • 146 Which one the steps which we are using to build a form with template driven ?

          • 147 When we will use the form using Template driven, Which module we have to add and where ?

          • 148 How many ways by which we can add form validation?

          • 149 How we will use Template-Driven Form Validation ?

          • 150 Why we are checking dirty and touched?

          • 151 What is Reactive Forms?

          • 152 When we will use the form using Reactive, which module we have to add and where?

          • 153 What is Dynamic Form and how we can implement it in Angular application?

          • 154 Which classes we are using for show with form according to status of form:

          Testing Based

          • 155 What is unit testing?

          • 156 What is the need of Karma and jasmine in Angular?

          • 157 How we can use Karma and Jasmine in Angular in Angular for testing?

          • 158 What is the need of ng test ?

          • 159 What is the need of testts in Angular?

          • 160 What is test bed?

          • 161 We have extension spects in Angular application what is use if it?