Which method can be used to convert a string to a number in JavaScript?
A). parseInt()
B). toString()
C). toNumber()
D). parseStr()
What will typeof [1, 2, 3] return?
A). array
B). object
C). number
D). list
How do you declare a variable with an undefined value?
A). let x;
B). let x = '';
C). let x = 0;
D). let x = null;
What is the output of typeof null?
A). null
B). undefined
C). object
D). number
What is the result of typeof Symbol('id')?
A). symbol
B). object
C). string
D). undefined
Which of the following is not a primitive data type in JavaScript?
A). String
B). Number
C). Object
D). Boolean
Which of the following is a falsy value in JavaScript?
A). 0
B).
C). null
D). All of the above
What is the output of '5' + 3?
A). 8
B). 53
C). 8
D). Error
What will typeof NaN return?
A). number
B). NaN
C). undefined
D). object
What is the output of typeof function() {}?
A). function
B). object
C). undefined
D). number