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Interview Question and Answers - 3435 question(s) found - Order By Rating

Q1. What would you use the span element for ?

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Q2. 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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Q3. What is systemd in Unix ?

Unix

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Q4. Why cannot we initialize a final field within the constructor if the initialization is within try block ?

Core Java

Ans. What if the initialization throws an exception. In that case , it will let it move forward without initializing the final field. So it's a way to enforce that either the field is initialized or it fails completely.

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Q5. Can we initialize final fields within the constructor ? Why ?

Core Java

Ans. Yes, Because final fields needs to be initialized before the construction of the object completes. Not necessarily at the time of class loading.

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Q6. What is cyclic instantiation ? Have you ever faced any problem due to this ?

OOP

Ans. Cyclic instantiation in OOPs may happen if Class A loading results in Class B Loading , and then Class B Loading results in Class C loading and then Class C has a static reference to Class A and hence results in cyclic instantiation or loading.

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Q7. Can we have a directive that get's applied based on an attribute on a field ?

Angular

Ans. Yes

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Q8. How can we add a particular styling to a field based on a condition ?

Angular

Ans. We can create a directive to do that.

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Q9. What is the use of ElementRef in angular ?

Angular

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Q10. What is the use of Renderer class in angular ?

Angular

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Q11. What is the use of NgControl ?

Angular

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Q12. Can we have multiple selectors for a directive in Angular ?

Angular

Ans. Yes

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Q13. How can we add a text in front of all input fields in an application ?

Angular

Ans. We can create a directive with selector as 'input' and then onInit of the directive , we can append the text to the input control html.

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Q14. Can we get the validators for a control in angular ? How ?

Angular

Ans. No - https://github.com/angular/angular/issues/13461

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Q15. Will this code give any error ?

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

Typescript

Ans. No

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Q16. Will this code give any error ?

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

Typescript

Ans. No

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Q17. Will this code give any error ?

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

Typescript

Ans. No

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Q18. 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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Q19. Will the following code give any error

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

Typescript

Ans. No

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Q20. Will the following code give any error

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

Typescript

Ans. No

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Q21. 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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Q22. 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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Q23. 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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Q24. 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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Q25. 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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Q26. 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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Q27. How can you trim all strings in an array ?

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

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Q28. What is GIT Stash ?

Git

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Q29. What is conflict in GIT ?

Git

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Q30. What is staging in GIT ?

Git

Ans. Before completing the commits, it can be formatted and reviewed in an intermediate area known as staging.

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