how to remove property of object in javascript without delete

1var person = {"first_name": "Billy","last_name": "Johnson"};
2delete person.last_name; //delete last_name property

1 var person = {
2        name: "Harry",
3        age: 16,
4        gender: "Male"
5    };
6    
7    // Deleting a property completely
8    delete person.age;
9    alert(person.age); // Outputs: undefined
10    console.log(person); // Prints: {name: "Harry", gender: "Male"}

1const names = {
2  father: "Johnny",
3  brother: "Billy",
4  sister: "Sandy"
5}
6
7delete names.father
8// { brother: "Billy", sister: "Sandy" }
9
10delete names["father"]
11// { brother: "Billy", sister: "Sandy" }

1const names = {
2  father: "Johnny",
3  brother: "Billy",
4  sister: "Sandy"
5}
6
7const newNames = Object.keys(names).reduce((object, key) => {
8  if (key !== "father") {
9    object[key] = names[key]
10  }
11  return object
12}, {})
13
14// { brother: "Billy", sister: "Sandy" }