What’s the Difference Between Let, Var, and Const in JavaScript?

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To be honest, the statements let, var, and const can all be used to create bindings.

In fact, the binding names created from each statement type can be evaluated together in a single expression.

let firstName = "Gregory ";
var middleName = "Booker ";
const lastName = "Power";

console.log(firstName + middleName + lastName);
// -> Gregory Booker Power

What is let in JavaScript?

For now, just understand that let is a statement that initiates the binding of a variable to a value.

What is var in JavaScript?

var (all lowercase) is short for variable. It was a statement used before 2015, and it has subtle differences compared to let.

Let’s just consider them the same thing because they do almost everything similarly, except for a few things.

What is const in JavaScript?

const (all lowercase) is short for constant.

It basically defines the variable as a constant binding which means it can’t be changed to anything else.

This also means that using the = operator to change this binding to grab something different won’t work.

You can’t reassign to a const variable.

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