Accidental_Global_Variable_Hoisting.js

// 'use strict' for getting rid of Accidental Global variables

var a = 10;
undefined
typeof a;
'number'
a;
10
b = 20; // Assign (Accidental Global)
20
typeof b;
'number'
function show(){
    // var r; // r value undefined
    console.log('Before r ', r);
    // r = 10;
    var r = 10; // Hoisting (Place at Top)
    // r = 20;
    var r = 20;
    console.log(r);
}
undefined
show();
VM401:3 Before r  undefined
VM401:8 20
undefined
var g = 100; // Hoisting (window)
undefined
window.g;
100
g;
100
yy =88; 
88
yy;
88
typeof yy;
'number'
window.yy;
88