Which of the following values is considered falsy in JavaScript?
A). 1
B). 0
C). 0
D). {}
What will typeof NaN return in JavaScript?
A). number
B). NaN
C). undefined
D). object
What will typeof null return in JavaScript?
A). null
B). undefined
C). object
D). number
How can you check if a variable is an array in JavaScript?
A). typeof variable === 'array'
B). Array.isArray(variable)
C). variable instanceof array
D). variable.constructor === array
What is the type of the value returned by JSON.parse('null')?
A). null
B). string
C). object
D). undefined
What does the parseInt function do in JavaScript?
A). Converts a number to a string
B). Converts a string to an integer
C). Converts a boolean to a number
D). Converts an array to a number
In JavaScript, what will be the type of a variable x after x = 5 + true;?
A). number
B). string
C). boolean
D). undefined
Given let a = '10'; let b = 20;, what is the result of a + b?
A). 30
B). 1020
C). 30
D). NaN
Which operator is used to determine the type of a variable in JavaScript?
A). typeof
B). instanceof
C). type
D). isType
What will be the result of the following code: let z = '123'; z = Number(z); console.log(typeof z);?
A). string
B). number
C). undefined
D). boolean