number-munchers/controllers/board/muncher.controller.js

import * as MuncherActions from '../../actions/board/muncher.actions';
import BoardCtrl from './board.controller';
import SETTINGS from '../../AppSettings';

let x = 0;
let y = 0;
let dispatch;

const MuncherCtrl = {
    getX: () => x,
    getY: () => y,
    setDispatch: d => dispatch = d,

    move: (e) => {
        e.preventDefault();
        
        switch (e.keyCode) {
            case 37:
                if (x !== 0) {
                    x -= 1;
                }
                break;

            case 38:
                if (y !== 0) {
                    y -= 1;
                }
                break;

            case 39:
                if (x !== SETTINGS.GRID_WIDTH - 1) {
                    x += 1;
                }
                break;

            case 40:
                if (y !== SETTINGS.GRID_HEIGHT - 1) {
                    y += 1;
                }
                break;
        }

        if (e.keyCode >= 37 || e.keyCode <= 40) {
            dispatch(MuncherActions.update(x, y));
            BoardCtrl.checkCollision();
        }
    }
};

export default MuncherCtrl;