/* Norton's spin on the Virtual World project #6 (May 2019)

Now compliant with ES6 strictness and import/export.
Follows the factory pattern; assumes an options
object is passed in from the client.  

Sample app.js client:

    import { World, WorldItemFactory, worldPlanBuilder } from './app/worldES6.js'

    var app = { };

    app.load = function () {
        console.log("Hello!")

        const ROWS = 40;
        const COLS = 60;
        let itemOptions = {

            wall: { symbol: "#", buildChance: 10 },
            plant: { symbol: "p", buildChance: 2, ableToMoveOn: ["empty"] },
            animal: { symbol: "a", buildChance: 2, ableToMoveOn: ["empty", "plant"] },
            carnivore: { symbol: "c", buildChance: 2, ableToMoveOn: ["empty", "animal"] },
            empty: { symbol: " ", buildChance: null }
        };
        
        
        let worldPlan = worldPlanBuilder(ROWS, COLS, itemOptions);
        let worldItemFactory = new WorldItemFactory(itemOptions);
        var world = new World(worldPlan, worldItemFactory);
        animateWorld(world);
    }

    export { app };

Sample front-end HTML using the above app as ES6 module
-------------------------------------------------------

    <script src="https://redrockcode.com/educationMaterials/workbenchProjects/phase-i/virtual-life-01-app/animate-world.js"></script>
    <script type="module">

        import { app } from './app.js';

        app.load();

    </script>