Difference between var and let in JavaScript

In JavaScript, we use both var and let to declare a variable. However, they are not understood the same. The differences between them are scope. var is function scoped while let is block-scoped.

If a variable is defined with let in a later code block, it returns an error of no existing variable, while it returns undefined (declared but no value) with var.

Example of var

var book = 'Learn Flutter';

Example of let

let book = 'Learn Kotlin';

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