Get closest

import flash.display.MovieClip;

var myArray:Array = new Array();
var theEnemy:MovieClip;

stage.addEventListener(Event.ENTER_FRAME, enterFrameLoop);

function enterFrameLoop(event):void
{
	theEnemy = getClosestClip(hero, myArray);

	hero.x += (theEnemy.x-hero.x)/4;
	hero.y += ((theEnemy.y-80)-hero.y)/4;
}

function getClosestClip(hero:MovieClip, enemyArray:Array):MovieClip {
	var closestEnemy:Number = 25000000;
	var finalEnemy:MovieClip;

    for (var i:int = 0; i < enemyArray.length; i++)
    {
        var currentEnemy:MovieClip = enemyArray[i];
        var dist:Number = Math.pow(hero.x-currentEnemy.x,2)+Math.pow(hero.y-currentEnemy.y,2);

        if (dist < closestEnemy)
        {
            closestEnemy = dist;
			finalEnemy = currentEnemy;
        }
    }
	return finalEnemy;
}