A weird behaviour of JavaScript about variables with same name management.

gistfile1.js

// Weird thing:
// ************
//
// The following code does not throw any error, despite i is declared twice
// and I am using "use strict".
//
// So I was expecting the i in the inner for loop to be a different variable
// than the other i (and that it would override it in its own scope).
//
// But it does not: The log is:
// > 01
// when I was expecting more:
// > 0101
(function(){
  "use strict";
  var str = '';
  for (var i = 0; i < 2; i++)
    for(var i = 0; i < 2; i++)
      str += i;
  console.log(str);
})()