let, cont, Var

Question 1

What are the three ways of declaring variables in JavaScript?

Answer 1

let, const, Var

Question 2

Explain let

Answer 2

let is used to declare variables that can change during the execution of a program.

Question 3

Explain const

Answer 3

const is used to create immutable variables.

Question 4

Explain Var

Answer 4

var is the old way of declaring variables prior to ES6.

Question 5

Can empty const variables be declared.

Answer 5

No, empty const variables can not be declared. This is because const variables are immutable and their values cannot be reassigned.

Question 6

Why is it good practice to have as little variable mutations as possible?

Answer 6

This is because changing variables introduces a potential to create bugs.