I do some Javascript programming from time to time. Just though I should start keeping some useful notes for my future reference (sometimes I waste time looking up something I have actually gone through :p).

I always declare use strict and use var to declare a variable. However I just found out alternatives: let and const, which is more relatable to my background in C programming. Both those options comes with block scope - before ES6(2015), Javascript only supports global scope and function scope. So, I will start to use let instead of var from now on.