var is dead? Then what do we make?

We learned about the use of let and const, and their scope.

But still a lot of people with Var, including me, some people say that Var is dead, we use let also useful const

In fact, Var is not dead, there is its functional category, the use of the variable re-assignment and re-binding. So you can use it well.

Let's talk about the const.

(1) A variable that binds only once

(2) Use of const by default

Let

Local variables for a smaller scope range

Use the inside of the function to further narrow the let's scope of use

Other literature: http://www.infoq.com/cn/articles/es6-in-depth-let-and-const/

var is dead? Then what do we make?