JavaScript is different: Finding the maximum or minimum element in an Array / List + randomization or shuffling

gistfile1.js

// www.lsauer.com lo sauer 2012 - BSD license
// description: several ways of finding the maximum or minimum element in a list
// with a demonstration of sorting-functions
// tood: add some benchmarks

var arr = [1,3,32,432,23,200,-10,30,44,1];
//#1 short version
for(var i=0,max=0; i<arr.length; arr[i]>max&&(max=arr[i]),i++);
//>432
for(var i=0,min=0; i<arr.length; arr[i]<min&&(min=arr[i]),i++);
//>-10

//#2 long version, extending the Array object
Array.prototype.max = function() {
    var i = 0;
    var _max = this[i];
    for( i=0; i < this.length; i++ ) {
        if( _max < this[i] )
            _max = this[i];
    }
    return _max;
}

//#3 sorting; allows individual sorting algorithm; mutable operation!
arr.sort().slice(-1)[0]; //max
arr.sort().[arr.length-1]; //max
arr.sort().reverse()[0] //max
arr.sort().pop(); //max; mutable operation i.e. shortens the array!
//>432
arr.sort()[0]
//>-10

//By passing a sorting function, we can use it for shuffling the array and other neat 
//if argument 1 or 'a' is >0 then the argument is moved to a lower index than argument 2 or 'b', and vice versa.

//tasks in addition to canonical sorting
//sort numerically, ascending
arr.sort( function(a,b){return a-b} );
//sort numerically, descening
arr.sort( function(a,b){return b-a} );

//sort by first ASCII character value
var arr = ['c',1,3,32,432,23,200,'b',-10,30,44,1,'a'];
arr.sort( function(a,b){return a.toString().charCodeAt(0) - b.toString().charCodeAt(0)} )
[-10, 1, 1, 200, 23, 3, 32, 30, 432, 44, "a", "b", "c"]

//shuffle
arr.sort( function(a,b){return .5-Math.random()} );


//#3 via 'apply'
var arr = ['c',1,3,32,432,23,200,'b',-10,30,44,1,'a'];
Math.max.apply(null,arr.filter(Number))
//>432

Math.min.apply(null,arr.filter(Number))
//>-10