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Array.prototype.myNewFunction = function() {
    //do something
}

var foo = ["bar","baz"];

/*
 * The following will print bar baz, myNewFunction
 */
for (data in foo) {
  console.log(data);
}

/*
 * Use an incrementing for loop instead
 */
for (var x=0; x<foo.length; x++) {
  var data = foo[x];
  //Do something with data
}