Day 8 – Var vs Let vs Const -Learning Node JS In 30 Days [Mini series]

Before es6 VAR was the King. We used var in everywhere we wants to declare a variable

var variables can be re-declared and updated

Now we divide var with two different types one CONST & other LET

CONST is declared for those value which will not changed anytime! Or will not be updated at any point. const cannot be updated or re-declared, this will lead you to an error you if try

We use LET when their is a change of updating the variable

LET can be updated but not re-declared. This will give a error you can’t run code

So in es6 we use LET & CONST not Var!

Do you knew this before ?