Javascript IOC

javascript_ioc.js

/*
  IOC ...
 */

const Bar = () => {
  return {
    hello: 'world'
  };
};

const baz = (s) => {
  return s.split("").reverse().join("");
};

const Container = (initialState) => {
  const mem = {};

  if(initialState){
    Object.keys(initialState).forEach(key => {
      mem[Symbol.for(key)] = initialState[key];
    });
  }


  return {
    register: (key, val) => mem[Symbol.for(key)] = val,
    get: (key) => mem[Symbol.for(key)]
  }
};

const container = Container({
  foo: 'Foo',
  bar: Bar(),
  baz
});

const control = (
  myFoo = container.get('foo'),
  myBar = container.get('bar'),
  myBaz = container.get('baz'),
) => {

  return {
    go(){
      console.log(myFoo);
      console.log(myBar);
      console.log(myBaz(`somestring`));
    }
  };
};

const controlA = control();
controlA.go(); /* >
      Foo
      { hello: 'world' }
      gnirtsemos
*/
container.register('foo', 'Foo bar baz .. changed!');
container.register('baz', (s) => s.toUpperCase());

const controlB = control();
controlB.go();/*
      Foo bar baz .. changed!
      { hello: 'world' }
      SOMESTRING at myBaz(`somestring`) 
*/

controlA.go();/* >
      Foo
      { hello: 'world' }
      gnirtsemos
*/