//let
1. It is block-scoped.
2. It does not allow to redeclare variables.
3. Hoisting does not occur in let.
// var
1. It is function scoped.
2. It allows to redeclare variables.
3. Hoisting occurs in var.let = 10 // accessable only in defined scope
var = 10 // accessable in the function it is declared in (global variable in a function)
------------------Differences------------------ var let
Global Scope Yes No
Can be changed outside statement where made in Yes No
Block Scope No Yes/* DIFFERENCE BETWEEN LET AND VAR */
//LET EXAMPLE
{
let a = 123;
};
console.log(a); // undefined
//VAR EXAMPLE
{
var a = 123;
};
console.log(a); // 123In simple words 'var' is function scoped and 'let' is block scoped