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Q31. 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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Q32. What does this warning message for the unit test means

WARN: 'Spec has no expectations.'

Angular

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Q33. How can you delete a commit from a pull request ?

Git

Ans. By rolling back that commit in the branch

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Q34. Do you ever merge changes from one feature branch to another ? Why ?

SCM

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Q35. How do you merge changes from master to your feature branch ?

Git

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Q36. How to you resolve merge conflicts in GIT ?

Git

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Q37. Can we do a thread specific heap allocation ?

Memory Management

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Q38. What resources are shared between threads ?

Threads

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Q39. Do threads have a distinct heap ?

Memory Management

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Q40. 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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Q41. 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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Q42. 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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Q43. 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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Q44. 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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Q45. What do we specify within the pipe method ?

RxJs

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

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Q46. 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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Q47. 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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Q48. 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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Q49. Can you write a regex pattern that would validate if the word starts with a capital alphabet and then alphanumeric thereafter.

Regex

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

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Q50. What is the difference between Merge and "Stash and Merge" ?

Git

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Q51. What is the difference between Subject and Observable ?

Angular

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Q52. What is the difference between subscribe and unsubscribe ?

Angular

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Q53. What is the difference between subscribe and emit ?

Angular

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Q54. Have you ever faced problem because of some listener / observers / subscriber performing action on the subscription which you don't want ? How did you fix the problem ?

Angular

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Q55. What is the difference between closing and completing the observer / listener ?

Angular

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Q56. What is a pseudo-class?

CSS

Ans. It is a CSS technique that sets the style when an element changes its state. E.g. style changes when mouse hover, different styles for visited or unvisited links, etc.

There are four different types of pseudo-classes:

Links: These pseudo-classes are used to style the link both in its normal state by default and when it has already been visited
Dynamic: Dynamic pseudo-classes can be applied to any element to define how they are shown when the cursor is located on them, or by clicking on them or when they are selected
Structural: Structural pseudo-classes allow to style elements based on an exact numerical position of the element
Others: Some elements can be styled differently based on the language or what type of label they are not.
Format
Name
Elements are styled if
Compatibility
Link and Dynamic Pseudo-classes
: link   Link   the value of the href attribute is not in the history   IE4, FF1, O3.5, S1, CSS1
: visited   Link Visited   the value of the href attribute is in the history   IE4, FF1, O3.5, S1, CSS1
: target   Target Link   a targeted link   FF1.3, O9.5, S1.3, CSS3
: active   Active   the element has been clicked   IE7, FF1, O3.5, S1, CSS1
: hover   On   the cursor is over the element   IE4 *, FF1, O3.5, S1, CSS2
: focus   Focus   the element captures the focus of the document   IE7, FF1, O7, S1, CSS2
* Only available for the item before IE7
Structural and Other Pseudo-classes
: root   Root   is the main element of a document   FF1.5, O9.5, S3.1, C3, CSS3
: empty   Empty   does not have child nodes   FF1.5, O9.5, S3.1, C3, CSS3
: only-child   Only son   has no sibling nodes   FF1.5, O9.5, S3.1, C3, CSS3
: only-of-type   Type Only   has a unique selector among its siblings   FF1.5, O9.5, S3.1, C3, CSS3
: first-child   First son   is the first child node of another element   FF1.5, O9.5, S3.1, C3, CSS3
: nth-of-type (n)   Nth of Type   is the nth element with that selector   FF1.5, O9.5, S3.1, C3, CSS3
: last-child   Last son   is the last child node of an element   FF1.5, O9.5, S3.1, C3, CSS3
: first-of-type   First of the Kind   is the first element of its selector type in the parent element   FF1.5, O9.5, S3.1, C3, CSS3
: last-of-type   Last of the Type   is the last element of its selector type in the parent element   FF1.5, O9.5, S3.1, C3, CSS3
: lang   Language   has a specifically defined language code   IE8, FF1.5, O9.5, S3.1, C3, CSS2.1
: not   Denial   you are not using a specific selector   FF1.5, O9.5, S3.1, C3, CSS3

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Q57. What are the main features of Java?

Core Java

Ans. a) Object Oriented
b) Simple
c) Platform Independent
d) Secured
e) Robust
f) Portable
g) Multithreaded
h) Distributed

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Q58. What are the fundamental principles of object oriented programming? / What are the OOPs concepts?

Core Java

Ans. a) Inheritance
b) Abstraction
c) Polymorphism
d) Encapsulation

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Q59. What do you mean by inheritance in java?

Core Java

Ans. Inheritance is one of the key principle of object oriented programming. Through inheritance, one class can inherit the properties of another class. The class from which properties are inherited is called super class and the class to which properties are inherited is called sub class.

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Q60. Which one of AWS Lambda or API Gateway is a compute service ?

Amazon Web Services (AWS)

Ans. AWS Lambda

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