Interview Questions and Answers for 'Script' | Search Interview Question

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Q61. write an angular Typescript program to add item into an array

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Q62. What are some downsides to static typing in TypeScript?

TypeScript

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Q63. What do you think of TypeScript?

TypeScript

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Q64. what is strict mode in javascript ? How is it used ?

Javascript

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Q65. Have you ever used sessionStorage ? What is the better way to store session information - sessionStorage or session cookie ?

Session Management

Ans. Session Cookie, because session storage can be accessed from XSS (Cross site Scripting) attacks but cookies (if set with "HttpOnly" and "Secure" flags) are more safer against these attacks.

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Q66. What are the benefits of using UI framework like Angular , View js etc instead of plain vanilla js and html ?

Javascript

Ans. These frameworks facilitates easier product development and enhancement and maintainability by having separation of concerns ( using oops ) and helps in development of reusable libraries / components. So in nutshell , they make development and maintenance of large scale application easier.

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Q67. How can print the whole object state in the console in javascript ?

Javascript

Ans. We can JSON.stringify

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Q68. How can you trim all strings in an array ?

Ans. array.map(s => s.trim())

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Q69. Is it safe to use session storage ?

Javascript

Ans. Session storage can be accessed from XSS (Cross site Scripting) attacks but cookies (if set with "HttpOnly" and "Secure" flags) are more safer against these attacks.

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Q70. Can we specify that a particular variable may have either of the two data types in Typescript ?

Typescript

Ans. let result: string | boolean;

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Q71. How can we specify that a particular variable may have either of the two data types in Typescript ?

Typescript

Ans. Yes

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Q72. How can we specify that a particular variable may have either of the two data types in Typescript ?

Typescript

Ans. let result: string | boolean;

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Q73. What does the following declaration mean

let result: string | number;

Typescript

Ans. It means we can assign either a string or a number to result.

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Q74. Will the following code give any error

let result: string | number;
result = true;

Typescript

Ans. Yes, result can either be string or a number but not boolean.

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Q75. Will the following code give any error

let result: string | number;
result = 'true';

Typescript

Ans. No

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Q76. Will the following code give any error

let result: string | number;
result = 'true';

Typescript

Ans. No

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Q77. Will the following code give any error

let result: boolean;
result = false | true;

Typescript

Ans. Yes, | is a bitwise operator and not boolean or. Use || instead

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Q78. Will this code give any error ?

let result: boolean;
result = false || true;

Typescript

Ans. No

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Q79. Will this code give any error ?

let result: boolean | string;
result = false || 'true';

Typescript

Ans. No

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Q80. Will this code give any error ?

let result: string;
result = false || 'true';

Typescript

Ans. No

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Q81. What is Array.Map function ? What will be output of following ?

const myArray = [1, 4, 9, 16];
const result = myArray.map(x => x * 2);

Javascript

Ans. It will create an array with each value as x*2

[2, 8, 18, 32]

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Q82. Which of the following file is called deployment descriptor ?

Java EE

a. application.xml

b. web.xml

c. config.xml

d. web-application.xml

Ans.b. web.xml

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