What is if-action, and loop-action?

[Mgeterno11]

Hi everyone,

I often see in random maps and tutorials the if-and else actions? What they are for? When are they necessary?

If I make an unit group, it is necesarry to put it into loop-action, or I can do it without it?

I would appreciate every help.

 

[Chaosy]

Yes, they are often needed.
This is in Zinc but it's commonly used in GUI as well:

                if(winner.allCounters[i].CostFilter(p))
                {
                    if(winner.allCounters[i].filter != null)
                    {
                        if(filterFunc(winner.allCounters[i].filter))
                        {
                            BJDebugMsg("calling build! 1");
                            Build(p, winner.allCounters[i].unitID);
                            break;
                        }
                        else
                        {
                            BJDebugMsg("requirements were not met.");
                        }
                    }
                    else
                    {
                        BJDebugMsg("calling build! 2");
                        Build(p, winner.allCounters[i].unitID);
                        break;
                    }
                }
                else
                {
                    BJDebugMsg("not enough gold or lumber");
                }
                i += 1;
            }

The usage is waaay to common to give one specific answer of when to use them, they come in handy all the time.

_____________________________

A unit group loops through all units automatically.

 

[Mgeterno11]

Thank you. How do I use this jass in trigger editor?

So, if I make an unit group, which will pause units in cinematic, I should use loop-action, shouldn't I? How do I make that?

 

[Chaosy]

You don't need jass. I just happened to have a good example in jass.

Pick all units in <group>
pause picked unit

edit: there is actually a action that pauses all units without a unit group:

• Unit - Pause all units

However, for learning purposes you would as I said do:

• Unit Group - Pick every unit in (Units in (Playable map area)) and do (Actions)
  • Loop - Actions
    • Unit - Pause (Picked unit)

 

[Mgeterno11]

Thank you very much.

 

[Anitarf]

Loops are used when you want to repeat the same actions multiple times. Usually, you don't want the actions to be exactly the same, for example you want to run the same code but each time on a different unit. That's why we have different loops, there are unit group loops like mentioned above which repeat the same actions for each unit in a group, then you have integer loops that repeat the same code a certain number of times and use an integer variable to tell the code how many times it has already run.

If statements are used when you want an action to occur only if a condition is true. That way, you can make your code respond to the state of the game, for example you can run different actions if a certain unit is alive than you would if it is dead.

 

[Wietlol]

Looping through all the units on the map but only applying the actions in the loop if the units are undead.
How about that for an example?

 

[Mgeterno11]

Thanks both of you.
I make a cinematic in a map,and when it starts, I want all units to stop.