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Group filter - Callback function


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Dear this a newbie question.

I try to use the group filter but i cannot be able to do that successfully.

Could you giving me some advice to do that and also could you giving me some info about the "callback" function and how it works, also how to pass parameter to it ?


Kind Regards




See this exemple :


this.unitGroup.filter(function(unit,game) {
           if (unit.selected == true && unit.name == 'settler' ){
               game.buildCityButton.visible = true;
           } else {
            game.buildCityButton.visible = false;
    }, this);
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