JavaScript - let keyword

let me explain 😝

JavaScript let keyword is a better replacement for var for the below reasons. This got introduced in ES6 (duh!)

• It has better scoping which is block scope. That means you can use let more confidently in loops without polluting the scope of the enclosing function.
• Because of block scope, the whole suite of scope related issues can be avoided.
• Unlike var, values declared using let are not hoisted, so you will not be able to use those values before the declaration.
• At root level if you declare a value using let, this will not add it to the window global object.
• Re-declaring let values will throw an error.

More discussion in stack-overflow.