Reducer solution memo

[TyrealGray]

One Dispatch example

dispatch({type: KILL_ACTION, payload:{triggerBy: houyi, triggerTo: npc1});

const npcInfo = (state = initState, action) =>
	produce(state, draft => {
		const { type: actionType, triggerBy, triggerTo } = action;
		draft.npcs.forEach( (npc,index) => if( npc[actionType] ){
		const { onlyDirect, isAny, types, triggers, blockers } = npc[actionType];
		if((onlyDirect && triggerTo.id !== npc.id)
		|| blockers.includes(triggerBy.id))
		|| (!isAny && !types.includes(triggerBy.type) && !triggers.includes(triggerBy.id))){
			return;
		}
		/* reaction -> e.g: [
			{type:ADD, props:'hp', value: 100 },
			{type:MAYBE_ADD, props:'mp', rate: 0.9 , value: 0 },
		] */
		const reactions = npc[actionType].reactions;
		// processReaction is a function in common util 
		const updatedNpc = processReaction(reactions, npc);
		draft.npcs[index] = updatedNpc;
	})
}

const processReaction = (reactions, target) => {
	for (const reaction of reactions){
		switch(reaction.type){
			case ADD:
				target[reaction.props] += reaction.value;
				break;
			case MAYBE_ADD:
				if(randomCheck(seed)){
					target[reaction.props] += reaction.value;
				}
				break;
				//...
		}
	}
	return target;
}