Common Mistakes In writing Javascript

1) Overusing Global Variables:

  function printString(){

    value = "local";

   return value;

}

value = "global";

Output:

 print ( value) : global

 print(printString()) : local

 print(value) : local

2) Always define array by this syntax:

var abc = [];
var abc = [1,2,3,4,5];