Difference between var and let

#1

what is the difference between var and let

#2

difference between var and let lies in the scope. var is function scoped and let is blocked scoped. you can read more about it here

#3

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#4

Variables declared by “var” keyword are scoped to the immediate function body (function scope) while “let” variables are scoped to the immediate enclosing block denoted by {…} (block scope).

Variable declared with var keyword can be re-declared and updated in the same scope while variable declared with let keyword can be updated but not re-declared.

Variables defined with let are hoisted to the top of the block , but not initialized. This means that the block of code is aware of the variable, but it cannot be used until it has been declared. So, using a let variable before it is declared will result in a ReferenceError.