partial keys

function partialKeys (obj) {
  const keys = Object.keys(obj);
  keys.sort();
  const handler = {
    get(obj, name) {
      for(let i = 0, j= keys.length; i<j;i++){
        if(keys[i].startsWith(name))
          return obj[keys[i]];
      }
    },
  };
  
  const api = new Proxy(obj, handler);
  return api;
}