JavaScript 객체에 `filter()` 메서드를 어떻게 구현할 수 있나요?

Object.prototype.filter = function(predicate) {
  var result = {};

  for (key in this) {
    if (this.hasOwnProperty(key) && !predicate(this[key])) {
      result[key] = this[key];
    }
  }

  return result;
};

Object.filter = (obj, predicate) => 
  Object.keys(obj)
        .filter(key => predicate(obj[key]))
        .reduce((res, key) => (res[key] = obj[key], res), {});

Object.filter = (obj, predicate) => 
  Object.entries(obj)
        .filter(([key, value]) => predicate(value))
        .reduce((acc, [key, value]) => ({ ...acc, [key]: value }), {});

Object.filter = (obj, predicate) => 
  Object.fromEntries(
    Object.entries(obj).filter(([key, value]) => predicate(value))
  );

var scores = {
  John: 2,
  Sarah: 3,
  Janet: 1
};
var filtered = Object.filter(scores, score => score > 1); 
console.log(filtered);