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Interview Questions and Answers for 'Script' - 81 question(s) found - Order By Rating

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 Q1. 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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   Like         Discuss         Correct / Improve          Asked in 2 Companies


 Q2. Will this code give any error ?

let result: string;
result = false || 'true';
Typescript
Ans. No

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 Q3. Will this code give any error ?

let result: boolean | string;
result = false || 'true';
Typescript
Ans. No

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 Q4. Will this code give any error ?

let result: boolean;
result = false || true;
Typescript
Ans. No

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 Q5. 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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 Q6. Will the following code give any error

let result: string | number;
result = 'true';
Typescript
Ans. No

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 Q7. Will the following code give any error

let result: string | number;
result = 'true';
Typescript
Ans. No

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 Q8. 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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 Q9. 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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 Q10. 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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 Q11. 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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 Q12. 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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 Q13. 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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   Like         Discuss         Correct / Improve     session storage  security


 Q14. How can you trim all strings in an array ?
Ans. array.map(s => s.trim())

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   Like         Discuss         Correct / Improve     java   angular   typescript   javascript


 Q15. How can print the whole object state in the console in javascript ?Javascript
Ans. We can JSON.stringify

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   Like         Discuss         Correct / Improve     javascript  angular


 Q16. 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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   Like         Discuss         Correct / Improve     Javascript Frameworks  Angular  View js


 Q17. 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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   Like         Discuss         Correct / Improve     SessionStorage  session cookie  session management  javascript


 Q18. what is strict mode in javascript ? How is it used ?Javascript
 This question is still unanswered. Can you please provide an answer.


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 Q19. What do you think of TypeScript?TypeScript
 This question was recently asked at 'Intelliware Development'.This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve          Asked in 1 Companies


 Q20. What are some downsides to static typing in TypeScript?TypeScript
 This question was recently asked at 'Workday'.This question is still unanswered. Can you please provide an answer.


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 Q21. write an angular Typescript program to add item into an arrayTypeScript
 This question was recently asked at 'Moneris'.This question is still unanswered. Can you please provide an answer.


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 Q22. Do you know typescript ?TypeScript
 This question was recently asked at 'Fuze'.This question is still unanswered. Can you please provide an answer.


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 Q23. What are the advantages of using TypeScript over Javascript ?TypeScript
 This question was recently asked at 'Quicken Loans'.This question is still unanswered. Can you please provide an answer.


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 Q24. What new features of TypeScript do you like ?TypeScript
Ans. TypeScript is used to Apply types to your JavaScript code, And it shows the error in IDE while writing code and make us to fix it to avoid any bug or issue before build and deployment, for example: you put //@ts-code at top of your js file, and it will show errors in file when u make common code mistakes.

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 Q25. How can we make the constructor variables optional in Typescript ?TypeScript
Ans. Using "?" with the variables

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 Q26. What is the role of "?" in TypeScript constructors ?TypeScript
 This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     Typescript constructor


 Q27. How do we specify constructors in TypeScript ? How is it different from other languages ?TypeScript
 This question is still unanswered. Can you please provide an answer.


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 Q28. How do we initialize objects in TypeScript ?TypeScript
Ans. Using new operator

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 Q29. How is cohesion achieved in JavaScript ?JavaScript
 This question is still unanswered. Can you please provide an answer.


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 Q30. What is the difference between field and property in Typescript ?TypeScript
 This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     field vs property in typescript


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