CC Zone of Danger Help

//getNearestEnemy()
var enemies = this.getEnemies();
var nearestEnemy = enemies[0];
for(var enemy in enemies){
    if(this.distanceTo(enemy) < this.distanceTo(nearestEnemy)){
        nearestEnemy = enemy;
    }
}
return nearestEnemy;
//distanceTo(target)
return Math.sqrt(Math.pow(this.pos.x-target.pos.x)+Math.pow(this.pos.y-target.pos.y));