Can someone explain this Javascript code?

Can someone explain this Javascript code?

I saw this posted on stackoverflow. How would someone call such a function. The poster did not provide any example, of course.

  1. Array.max = function( array ){
        return Math.max.apply( Math, array );
    };                 

  3. Here is something I tried. A bad guess:

var array1 = [1,16,0,32,11];
Array.max = function( array ){
    return Math.max.apply( Math, array );
};
alert(array1.max);


(I don't know the proper way of providing two code blocks on this forum, so this does look a bit messy)