JavaScript (Basic to DOM)

Which of var, let, and const uses block scope?

• var

• let

• const

• both let and const

Which is an example of a JavaScript primitive data type?

• Object

• Array

• Number

• Function

Which ways can you concatenate strings?

• + operator

• Template literals

• concat() method

• All of the above

What is the difference between == and ===?

• Both check type

• == does type conversion

• === does type conversion

• Both are the same

What is the correct syntax for a template literal?

• "Hello ${name}"

• 'Hello ${name}'

• `Hello ${name}`

• (Hello ${name})

Which is an example of type conversion?

• Number("5")

• String(123)

• Boolean(1)

• All of the above

What is the full form of NaN?

• Not a Null

• Not a Number

• Null as Number

• None of the above

Which is the correct syntax to declare a variable?

• var num = 5;

• let num = 5;

• const num = 5;

• All of the above

Which one represents an intentional empty value?

• null

• undefined

• both

• none

How to write a single-line comment in JavaScript?

• <!-- comment -->

• // comment

• /* comment */

• b and c