ECMAScript 5 compatible mixin example from: http://www.nczonline.net/blog/2012/12/11/are-your-mixins-ecmascript-5-compatible/

mixin.js

function mixin(receiver, supplier) {
  Object.keys(supplier).forEach(function(property) {
    Object.defineProperty(receiver, property, Object.getOwnPropertyDescriptor(supplier, property));
  });
}

var name = 'Ed',
supplier = {
  get name() {
    return name;
  }
},
receiver = {};
mixin(receiver, supplier);
    
console.log('supplier.name: ' + supplier.name);
console.log('receiver.name: ' + receiver.name);