Rocket.Chat.ReactNative/app/reducers/selectedUsers.js

import { SELECTED_USERS } from '../actions/actionsTypes';

const initialState = {
	users: [],
	loading: false
};

export default function(state = initialState, action) {
	switch (action.type) {
		case SELECTED_USERS.ADD_USER:
			return {
				...state,
				users: state.users.concat(action.user)
			};
		case SELECTED_USERS.REMOVE_USER:
			return {
				...state,
				users: state.users.filter(item => item.name !== action.user.name)
			};
		case SELECTED_USERS.SET_LOADING:
			return {
				...state,
				loading: action.loading
			};
		case SELECTED_USERS.RESET:
			return initialState;
		default:
			return state;
	}
}