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ANGULAR INTERVIEW QUESTIONS AND ANSWERS

1. What are the inbulit angular directives

2. What the different between a directive and component?

3. What is view Encapsulation?

4. How to communicate between parent and child components?

5. Event loop in JavaScript

6. Call and apply in JavaScript

7. Subject in angular

8. Static and public in angular

9. Observable in angular

10. Component in Angular

11. Event emitter

12. Event stop propagation

13. Single and Multithread in JavaScript

14. Difference between Obtrusive and Unobtrusive Javascript

15. Difference between Var, Let, Const

16. Difference between Promises and observable

17. In collection of array how to collect all the true state from Active true and Active false

18. API fetching

19. Routing and why do we use it?

20. Service and Guard

21. Component Interaction

22. JavaScript closure

23. JavaScript hoisting

24. JS difference between function vs variable hoisting

25. String inbuilt function

26. Reversing a number in an array

27. How to find missing number in an array

28. Es5 vs Es6 difference

29. Object oriented JS

30. Class and inheritance in JS

31. TypeScript data type

32. TypeScript advance vs JS

33. Compiler in TypeScript

34. What is callback function

35. Indexof() If the given value is not in the string / array it will return what?

36. Wht do we use directive

37. What is ngInclude

38. What is ngContent

39. What is ngStyle and ngClass

40. What is Angular frontend

41. Difference between Angular 2, 4, 5, 6, &7

42. What is pipe?

43. Explain the process how do we exchange the data from front end to server?

44. Explain API and how do we exchange the data from client side to server?

45. What is strict mode in JS?

46. Semantic element in HTML?

47. Lifecycle hook in Angular

47. What is Arrow function , write its syntax

48. Why do we use TS instead of JS?

49. Can we have any service for ngFor and ngIF in Angular

50. Difference between display: none & visiblity:hidden

51. What is primitive data type?

52. Whats is output for typeof (null);

53. Array method: Push, Pop, Shift, Unshift & splice

54. What is binding in JS?

55. What is polyfill in Angular?

56. Difference between directive and pipe in Angular?

57. What is @Input and @Output in Angular?

58. What is event distner and Host distner in Angular?

59. What is subscript method in Angular?

60. Why you will do ngOnDestroy after subscrib?

61. Pagination and dazy loading in Angular

62. What is SSE?

63. What is web sockets?

64. doAdd(1,2) doAdd(1,2,3,4) use the above arguments to sum the value. Using without any parameter receive throught the function.?

65. What are the new features in CSS3?

66. Write syntax for component, directives and pipe decorator

67. What is async pipe?

68. How did we work with multiple modules in our project?

69. What is Shadow DOM?

70. What is Shared Module?

71. What is routerActive?

72. Explain Call and apply method?

73. How did you reverse a string?

74. What are the directives available in router?

75. Explain ViewEncapsulation?

76. Viewchild in component Interaction?

77. Explain component metadata?

78. Explain JQuery selector?

79. What is Prototype?

80. What is Buffer (window storage)?

81. What is Object?

82. What is Observable and Promise?

83. How did you stop observable?

84. Explain the procss about angular project bootstrap?

85. Explain Life cycle in Angular?

86. Why do we use Angular instead of React JS?

87. What is display:block and display:none?

88. How did you hidden (not hide) the element in JQuery?

89. How did you get the value from input box using JQuery?

90. Explain ngFor and nglf? 20. What is hoisting in JS?

91. What is HTML API?

92. Write AJAX call syntax?

93. Closure

94. Hoisting

95. Diff between functional hoisting and variable hoisting

96. String inbuilt functions

97. Reversing a number in an array – program

98. How to find missing number in array – program.

99. What will be the output at below program Function fun (input: boolean){ Let a = 100; If (input){ Let b = a +1; Return b; } Return b;}

100. What are the basic rules of Decorators?

101. If you do not know a number at arguments to be passed to function in advance. you should use _____ parameter type

102. ________ keyword is used to access class’s member variables and functions inside class member function

103. In Angular. you can pass data from parent component to child component using

104. In Angular, you can pass data from child component to parent component using

105. Write a syntax for ngFor with example

106. We must import _______ module to use [ (ngModel)]

107. Import ________ module to use reactive form.

108. You can create local HTML reference cf HTML tag using variable which starts with character

109. Write a syntax to bind custom CSS class (e.g. highlighted) to a tag

110. You can access HTML local reforence alias in component’s typescript code using __________ decorator

111. In template driven form ________ object is created internally whenever we have below code

112. Choose correct form control class name which is set to true when value is modified

113. If you provide a service in two components “providers” section of @Component decorator, how many instances of service shall get created?

114. doAdd(1,2) doAdd( 1.2,3,4) use the above arguments to sum the values. using without any parameter receive through the function

115. New HTML element?

116. What are the new features in CSS3?

117. Write syntax for component, directives and pipe decorator?

118. What is async pipe?

119. How did we work with multiple modules in our project?

120. What is Shadow DOM?

121. What is Share Module?

122. What is routerActive?

123. Explain Call and apply method?

124. How did you reverse a string?

125. What are the directives available in router?

126. Explain ViewEncapsulation?

127. Viewchild in component Interaction?

128. Explain component metadata?

129. Explain JQuery selector?

130. What is Prototype?

131. What is Buffer (window storage)?

132. What is Object?

133. What is Observable and Promise?

134. How did you stop observable?

135. Explain the procss about angular project bootstrap?

136. Explain Life cycle in Angular?

137. Why do we use Angular instead of React JS?

138. What is display:block and display:none?

139. How did you hidden (not hide) the element in JQuery?

140. How did you get the value from input box using JQuery?

141. Explain ngFor and ngIf?

142. What is hoisting in JS?

143. What is HTML API?

144. Write AJAX call syntax?

145. Reduce and map method

146. Adthere component (once we use import the component to another one)

147. In JSON have one array then how to assign this array to an variable.

148. Did you use SCSS?

149. Which version you are using JS?

150. What is ES6?