GameMaker

//step
  keyAttack = keyboard_check(ord("Z"));

if (keyAttack) state = PLAYERSTATE.ATTACK_SLASH

switch (state)
{
    case PLAYERSTATE.FREE: PlayerState_Free(); break;
    case PLAYERSTATE.ATTACK_SLASH: PlayerState_Attack(); break;
    case PLAYERSTATE.ATTACK_DOUBLE: PlayerState_Combo(); break;
}

//create
var move = key_right - key_left;

hsp = move * walkspd;

vsp = vsp + grv;


if (sprite_index != sPlayerAttack)
{
    sprite_index = sPlayerAttack
    image_index = 0;
    ds_list_clear(hitByAttack);
}

mask_index = sPlayerAttackHB
var hitByAttackNow = ds_list_create();
var hits = instance_place_list(x,y,object6,hitByAttackNow,false);

if    (hits > 0)
{
    for (var i = 0; i < hits; i++)
    {
        var hitID = hitByAttackNow[| i]; ds_list_find_value(hitByAttackNow,i);
        if (ds_list_find_index(hitByAttack,hitID) == -1)
        {
            ds_list_add(hitByAttack,hitID)
            with (hitID)
            {
                instance_deactivate_object(object6);
            }
        }
    }
}
ds_list_destroy(hitByAttackNow);
mask_index = sPlayer;

if (animation_end())
{
    sprite_index = sPlayer
    state = PLAYERSTATE.FREE;
}