javascript variable scope demo

scope1.md

In the following example:

• i is defined; j is undefined but declared; k is undeclared thus causing error;
• indx is hoisted to the top of the function.

(function () {
  var i = 1;
  var j;
  console.log("i : " + i); // i : 1
  console.log("j : " + j); // j : undefined
  //console.log("k : " + k);// ReferenceError: k is not defined

  console.log("indx : " + indx);// indx : undefined
  
  for(var indx = 0; indx < 3; indx++){
    console.log("indx in for : " + indx);// indx in for : 0|1|2
  }

  console.log("indx after for : " + indx);// indx after for : 3

}())