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Q3391. Write a regex pattern that would validate if the word starts with a alphabet and then alphanumeric thereafter or few special characters (let's say . and _ ).

Regex

Ans. ^[a-z,A-Z][a-z,A-Z,0-9,._]*$

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Q3392. Write a regex pattern that would validate if the sting has only alphanumeric characters and no consecutive spaces.

Regex

Ans. ^([a-z,A-Z,0-9]*[ ]+)*$

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Q3393. What does pipe does on an observable ?

RxJs

Ans. With pipe we specify the operator function to which this observable is passed for transforming the observable.

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Q3394. What do we specify within the pipe method ?

RxJs

Ans. Operator function to which an observable is passed for transformation.

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Q3395. Why do we do transformation on the observable itself rather than doing it in the subscriber ?

RxJs

Ans. Because that way we just need to do that transformation at one place and not within each subscriber. Single source of truth.

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Q3396. Can we specify multiple functions in the pipe ? What happens if we do it ?

RxJs

Ans. Yes, We can specify multiple functions within pipe method. In that case first function get's called with the observable , the response if then passed to the second method and so on.

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Q3397. Can we specify multiple maps within pipe ?

RxJs

Ans. Yes, it's same as passing multiple methods within pipe. Output of one map is passed to second and so on.

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Q3398. How can we sort an observable of a user array on user name ( name being one of the field of user ) ?

RxJs

Ans. userArrayObservable.pipe(
map(userArray => {
return userArray.sort(comparator);
});
)

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Q3399. What does the pipe method return in Rxjs ?

RxJs

Ans. Pipe method is performed on an observable with the argument as a function. It returns the transformed observable with transformation being done by the specified method.

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Q3400. Do threads have a distinct heap ?

Memory Management

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Q3401. What resources are shared between threads ?

Threads

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Q3402. Can we do a thread specific heap allocation ?

Memory Management

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Q3403. How do you merge changes from master to your feature branch ?

Git

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Q3404. Do you ever merge changes from one feature branch to another ? Why ?

SCM

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Q3405. How can you delete a commit from a pull request ?

Git

Ans. By rolling back that commit in the branch

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Q3406. What does this warning message for the unit test means

WARN: 'Spec has no expectations.'

Angular

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Q3407. Which language is Git written in ? and What are it's benefits ?

Git

Ans. GIT is fast because it's written in C.

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Q3408. 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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Q3409. What is conflict in GIT ?

Git

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Q3410. What is GIT Stash ?

Git

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Q3411. How can you trim all strings in an array ?

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

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Q3412. 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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Q3413. 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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Q3414. 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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Q3415. 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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Q3416. 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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Q3417. 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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Q3418. Will the following code give any error

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

Typescript

Ans. No

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Q3419. Will the following code give any error

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

Typescript

Ans. No

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Q3420. 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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