let o, m, w, owm;

const map = new Map();

const obj = Object.create(null);

const wm  = new WeakMap();

const wm2  = new WeakMap();

const objSet = (ob, k, v)=>{

  ob[k] = v;

  return ob;

};

let data = Object.create(null);

wm.set(data, new Map());

wm2.set(data, Object.create(null));

​

for (let i = 65; i < 90; i++) {

  let t = String.fromCharCode(i);

  obj[t] = i;

  map.set(t, i);

  wm.set(data, (wm.get(data)).set(t, i));

  wm2.set(data, objSet(wm2.get(data), t, i));

}

​