Answers for "difference with const let in functions"

what is the difference between let and const in javascript

The difference is that with const you can only only assign a value to a variable
once, but with let it allows you to reassign after it has been assigned.

difference in var let and const

var: 
	* hoisted(global scope)
    * function scope
let:
    * block scope
    * reassignable
    * not redeclarable
const: 
    * block scope
    * not reassignable
    * not redeclarable