Fundamentals of let, const, var

Variables: Variables in JavaScript are containers for storing data. JavaScript allows the usage of variables in the following three ways:

var:

var is the most commonly used variable in JavaScript. It can be initialized to a value, redeclared and its value can be reassigned, but only inside the context of a function. It can be function scoped or globally scoped.

let:

let in JavaScript is similar to var only difference lies in the scope. var is function scoped, let is block scoped. It cannot be redeclared but can be reassigned a value.

const:

const in JavaScript is used to declare a fixed value that cannot be changed over time once declared. They can neither be redeclared nor be reassigned. They cannot be hoisted either.

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