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 later code block, it returns an error of no exist variable, while it returns undefined (declared but no value) with var.

Example of var

console.log(book);
var book = 'Learn Flutter';
console.log(book);

Example of let

console.log(book);
let book = 'Learn Kotlin';
console.log(book);

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