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

Interview Questions and Answers - Order By Newest

Q31. What are the features of TypeScript ?

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Q32. How to compile typescript ?

TypeScript

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Q33. Can we compile multiple type script files together ? How ?

TypeScript

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Q34. What is the use of this keyword in javascript ?

Javascript

Ans. This keyword refers to the current instance of the class.

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Q35. What does 'variable hoisting' mean?

JavaScript

Ans.

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Q36. How do you debug Javascript code ?

Javascript

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Q37. What are the ways we can get over XSS or cross site scripting vulnerability ?

Security

Ans. The counter measures of XSS are input validation and implementing a CSP (Content Security Policy).

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Q38. What is Defer Parsing JavaScript ?

JavaScript

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Q39. What is the difference between inheritance in PHP vs. Javascript?

JavaScript

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Q40. Write a method to track every click on a page.

JavaScript

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Q41. Have you had to work with memory leak problems in javascript ?

JavaScript

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Q42. prototypal inheritance in Javascript

JavaScript

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Q43. Difference between Let and Var in Javascript ?

JavaScript

Ans. Var scopes the variable to the nearest function whereas Let scopes the variable to nearest block.

For example -

function printNumbers() {
for(var i = 1; i < 3: i++){
console.log(i);
}

console.log(i); // works fine and will print 3 as i has a function scope and not local loop scope
}

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Q44. What are benefits of strongly typing variables ?

JavaScript

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Q45. How is the declaration of enum in Typescript differ from Javascript ?

TypeScript

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Q46. What is the type of variable if we don't set any type ?

TypeScript

Ans. Any

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Q47. Can we do type casting in Typescript ?

TypeScript

Ans. Yes

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Q48. What is arrow function in Typescript ?

TypeScript

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Q49. How Object-Oriented Programming is implemented in JavaScript? How they differ from other languages?

Javascript

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Q50. Explain interfaces in Typescript. How is it different compared to other languages ?

TypeScript

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Q51. 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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Q52. What is the difference between field and property in Typescript ?

TypeScript

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Q53. How is cohesion achieved in JavaScript ?

JavaScript

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Q54. How do we initialize objects in TypeScript ?

TypeScript

Ans. Using new operator

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Q55. How do we specify constructors in TypeScript ? How is it different from other languages ?

TypeScript

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Q56. What is the role of "?" in TypeScript constructors ?

TypeScript

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Q57. How can we make the constructor variables optional in Typescript ?

TypeScript

Ans. Using "?" with the variables

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Q58. 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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Q59. What are the advantages of using TypeScript over Javascript ?

TypeScript

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Q60. Do you know typescript ?

TypeScript

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