Примеси в JavaScript

Tasks:

see examples
implement extend(obj, ...objects) so keys from objects will be mixed into obj only if it doesn't contain those keys
implement wrap(obj, ...funcs) so if obj contains func.name it should be wrapped
implement mixin logable()
implement universal equilateral mixin for for N sides (see 6-class.js)
implement emitable with Object.defineProperty (see 6-evants.js)
implement mixin for prototypes (not instances)
implement extend for mixins with additional override:Boolean flag

const mix2 = [
  {
    override: true,
    toString() {
      return `${this.name} - ${this.city} - ${this.born}`;
    }
  },
  {
    override: false,
    age() {
      const year = new Date().getFullYear();
      const born = new Date(this.born).getFullYear();
      return year - born;
    }
  }
];

extend(obj1, mix1, mix2);