Given the code: let y = 10; y = true;, what is the type of y after execution?

In JavaScript, what will be the type of a variable x after x = 5 + true;?

A). number

B). string

C). boolean

D). undefined

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 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

What is the initial type of a variable declared with let a;?

A). null

B). number

C). undefined

D). object

Which operator is used to determine the type of a variable in JavaScript?

A). typeof

B). instanceof

C). type

D). isType

What will typeof null return in JavaScript?

A). null

B). undefined

C). object

D). number

What happens when you add a number and a string in JavaScript?

A). An error is thrown

B). The number is converted to a string

C). The string is converted to a number

D). Both are converted to boolean

What is the result of typeof [] in JavaScript?

A). array

B). object

C). list

D). undefined

What is the type of the value returned by JSON.parse('null')?

A). null

B). string

C). object

D). undefined

Given let a = '10'; let b = 20;, what is the result of a + b?

A). 30

B). 1020

C). 30

D). NaN