A simple function for finding the median value in an array of numbers.

median.js

var median = function(array){
	var med, a, len;
	
	len = array.length;
	
	/* Sort by numeric value */
	
	a = array.sort(function(a,b){return a - b});
	med = Math.floor(len / 2);
	
	/* 
	If we have an odd number of items, take the one at the mid point.
	Otherwise find the middle two and find the mean.
	*/
	if( len % 2 ){
		return array[med];
	} else {
		var mid_a = len / 2;
		med = array[len / 2] + array[ (len/2) - 1];
		return med / 2;		
	}
}

/* Example usage */
median([2,3,5,6,7,8,9,0]); // 5.5

median([2,3,5]); // 3