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TypeScript - Interview Questions and Answers for 'TypeScript' - 40 question(s) found - Order By Rating

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 Q1. Will this code give any error ?

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

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 Q2. Will this code give any error ?

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

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 Q3. Will this code give any error ?

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

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 Q4. 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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 Q5. Will the following code give any error

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

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

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 Q8. 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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 Q9. 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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 Q10. 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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 Q11. 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. 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


 Q13. 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


 Q14. 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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 Q15. 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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 Q16. 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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 Q17. 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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 Q18. 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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 Q19. How can we make the constructor variables optional in Typescript ?TypeScript
Ans. Using "?" with the variables

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 Q20. 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


 Q21. 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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 Q22. How do we initialize objects in TypeScript ?TypeScript
Ans. Using new operator

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 Q23. 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


 Q24. What is the difference between method and function in Typescript ?TypeScript
Ans. Method belongs to a class whereas function isn't. So the only difference is the scope in which they are defined.

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   Like         Discuss         Correct / Improve     method vs function in typescript


 Q25. Explain interfaces in Typescript. How is it different compared to other languages ?TypeScript
 This question is still unanswered. Can you please provide an answer.


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 Q26. What is arrow function in Typescript ? TypeScript
 This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     arraow functions in typescript   lambda expression vs arrow function


 Q27. Can we do type casting in Typescript ?TypeScript
Ans. Yes

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 Q28. What is the type of variable if we don't set any type ?TypeScript
Ans. Any

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   Like         Discuss         Correct / Improve     any type in typescript


 Q29. How is the declaration of enum in Typescript differ from Javascript ?TypeScript
 This question is still unanswered. Can you please provide an answer.


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   Like         Discuss         Correct / Improve     enum typescript  enum javascript


 Q30. Can we compile multiple type script files together ? How ?TypeScript
 This question is still unanswered. Can you please provide an answer.


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