Sorting of an Array in Javascript

This code snippet is for Sorting of an Array looks like a very simple question but many programmers fail in this wrt Javascript.

// For the sorting of an Array of Numbers
var tempArr = [2,4,11,3,9,18,15,10];
tempArr.sort(function(a,b){
   return a-b;
});
Output :: [2,3,4,9,10,11,15,18];

// For the sorting of an Array of Characters;
var tempArr2 = ['a','c','g','s','d','b','e'];
tempArr2.sort();
Output :: ["a", "b", "c", "d", "e", "g", "s"]

So in there 2 examples this can be easily visible for sorting of an Array of numbers we need a call back function for sorting but sorting of characters is very straight forward just by calling .sort() method with the array variable.