CRACK_JS_INTERVIEWS/scope.js at master · tkssharma/CRACK_JS_INTERVIEWS · GitHub

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var x = 90;

function hello(){

   var x = 100;
   console.log(x);


}
hello()
// check value in scope of function first
// check value outside or in global scope

//-----------------------------------------//

function hello(){
   var x = 100;
    // function level scope
   if(true){
       x =80;
   }
// console.log(x);
// x will be 80 here
}
//----------------------------------//
function hello(){//
   console.log(x);
   // undefined
   // function level scope
   // console.log(x);
  // x will be 80 here
  // hoisting of variables
  var x = 70;
}
//------------------------------------//
var x = 90 ;
function hello(){ // i know i have x inside me
  console.log(x); // ?? // x === 90

  var x = 70;  // function also have same variable
}