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

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Q2761. What is the difference between Subject and Observable ?

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Q2762. 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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Q2763. Can we do a thread specific heap allocation ?

Memory Management

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Q2764. Do you ever merge changes from one feature branch to another ? Why ?

SCM

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Q2765. How can you trim all strings in an array ?

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

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Q2766. 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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Q2767. 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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Q2768. 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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Q2769. 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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Q2770. 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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Q2771. 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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Q2772. Will the following code give any error

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

Typescript

Ans. No

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Q2773. Will the following code give any error

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

Typescript

Ans. No

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Q2774. 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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Q2775. Will this code give any error ?

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

Typescript

Ans. No

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Q2776. Will this code give any error ?

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

Typescript

Ans. No

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Q2777. Will this code give any error ?

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

Typescript

Ans. No

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Q2778. 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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Q2779. What is systemd in Unix ?

Unix

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Q2780. 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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Q2781. When String literals are compared using ==, they always returns true if the string values are same because .. Reference

Core Java

a. of overridden compareTo method

b. of overridden compare method

c. of String Pool

d. == means that the object contents are equal

Ans.c. of String Pool

Q2782. Which of the following is true ?

Core Java

a. Composition is Tightly Bound

b. Inheritance is Tightly Bound

c. Object can only hold reference of only one other object

d. A Class cannot be extended by multiple classes

Ans.b. Inheritance is Tightly Bound

Q2783. In case of String Literals .. Reference

Core Java

a. x==y on all literals always returns false

b. x.equals(y) on all literals always returns false

c. if x.equals(y) returns true, x==y returns true too

d. if x.equals(y) returns false, x==y returns true

Ans.c. if x.equals(y) returns true, x==y returns true too

Q2784. What is a default constructor ? Reference

Core Java

a. Constructor without parameters declared by user

b. Constructor provided by Java if no constructor is declared

c. Constructor with empty body

d. All of the above

Ans.b. Constructor provided by Java if no constructor is declared

Q2785. How can we create objects if we make the constructor private ?

Core Java

a. We can't create objects if constructor is private

b. We can only create objects if we follow singleton pattern

c. We can only create one object

d. We can create new object through static method or static block

Ans.d. We can create new object through static method or static block

Q2786. What will be the output of following ?

String str1 = new String("String1");
String str2 = new String("String1");
System.out.print(str1 == str2);
System.out.print(str1.equals(str2));
str1 = str2;
System.out.print(str1 == str2);

Core Java

a. falsetruetrue

b. truetruetrue

c. truetruefalse

d. falsetruefalse

Ans.a. falsetruetrue

Q2787. What will be the output of following code ?

String str1 = "String1";
String str2 = "String1";
System.out.print(str1 == str2);
System.out.print(str1.equals(str2));
str1 = str2;
System.out.print(str1 == str2);

Core Java

a. falsetruetrue

b. falsefalsetrue

c. truetruetrue

d. falsefalsefalse

Ans.c. truetruetrue

Q2788. What will be the output of following code ?

String str1 = "String1";
String str2 = "String2";
str1.concat("String3");
System.out.print(str1);
System.out.print(str2);

Core Java

a. String1String2

b. String1String3String3

c. String1String3String1String3

d. String1String1

Ans.a. String1String2

Q2789. What will be the output of following code ?

String str1 = "String1";
String str2 = "String2";
str1=str1.concat("String3");
System.out.print(str1);
System.out.print(str2);

Core Java

a. String1String2

b. String1String3String2

c. String1String2String3

d. String1Stringg3String1

Ans.b. String1String3String2

Q2790. Which method needs to be implemented if a class is implementing comparable interface ?

Core Java

a. comp

b. compare

c. compareTo

d. compareEquals

Ans.c. compareTo

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