Let vs. Var

I had this question before, and I got a fantastic answer (from Andren):

Let creates a block-scoped variable, this means that if lets say you had a while loop and within that while loop you defined a variable called "test" using let, that variable would only exist within the while loop code block. It would not be accessible from outside the while statement. If you created said variable using var instead, then the variable would be accessible from anywhere in the function even though it was defined within the while loop.

That is how variable scopes work in most other programming languages by default. So let is basically just a version of var that fixes the fact that JavaScript variables by default has a function scope regardless of where in the function they are defined, which has often been criticized as a fault of the language.

However other than the scope of the variable a "var" variable and a "let" variable act the same, they can both be reassigned whenever you want, neither of them are a constant.

Answer made by Andren

I hope this post helps you out :)

~Alex