function define(name, deps, implementation) {
        define.modules = define.modules || {};

        const depsArray = deps.map(name => define.modules[name]);
        define.modules[name] = implementation.apply(implementation, depsArray);
    }

    function require(name) {
        return define.modules[name];
    }

    define("bar",[], function(){
        function hello(who) {
            return "Hello to " + who;
        }

        return {
            hello: hello
        };
    });

    define("foo",["bar"], function(bar){
        var hungry = "John from bar";

        function foo() {
            console.log( bar.hello( hungry ).toUpperCase() );
        }

        return {
            foo: foo
        };
    });

    var bar = require( "bar" );
    var foo = require( "foo" );

    console.log(
        bar.hello( "John" )
    ); // Hello to John.

    foo.awesome(); // HELLO TO JOHN FROM BAR.