JavaScript オブジェクトから Null または未定義の属性を効率的に削除するにはどうすればよいですか?

// Return a new object without blank attributes
let o = Object.fromEntries(Object.entries(obj).filter(([_, v]) => v != null));

// Mutate the object in place (not recommended)
Object.keys(obj).forEach((k) => obj[k] == null && delete obj[k]);

// Return a new object with blanks removed
let o = Object.keys(obj)
  .filter((k) => obj[k] != null)
  .reduce((a, k) => ({ ...a, [k]: obj[k] }), {});

// Mutate the object in place (not recommended)
Object.keys(obj)
  .filter((k) => obj[k] != null)
  .forEach((k) => delete obj[k]);

function removeEmpty(obj) {
  const newObj = {};
  for (let prop in obj) {
    if (obj.hasOwnProperty(prop) && obj[prop] != null) {
      newObj[prop] = obj[prop];
    }
  }
  return newObj;
}