Interview Questions on Java Script

41. How to write “ in string that is enclosed with in doublequotes?

Use \”

42. How to write new line in string?

Use \n

43. How to write string in multiples lines?

Use \

44. Can we compare objects?

You can compare keys of objects.

45. How to get character from particular position in string?

Use CharAt(val);
Ex :- 
var str = "HELLO WORLD";
var res = str.charAt(0);

46. What is the method used for join two strings?

Conacat();
Ex :-
var str1 = "Hello ";
var str2 = "world!";
var res = str1.concat(str2);

47. What is the use of indexOf()?

Tells position of particular character or string.
Ex:-
var str = "Hello world, welcome to the universe.";
var n = str.indexOf("welcome");

48. What is the use of lastIndexOf()?

Tells position of last occurrence of  particular character or string.
Ex:-
var str = "Hello world, welcome to the universe.";
var n = str.lastIndexOf("welcome");

49. How to replace part of string?

Use str.replace();
Ex :-
var str = "Visit Microsoft!";
var res = str.replace("Microsoft", "W3Schools");

50. What is the use of split()?

The split() method is used to split a string into an array of substrings, and returns the new array.
Ex :-
var str = "How are you doing today?";
var res = str.split(" ");
res contains: How,are,you,doing,today?