how delete property on object javascript code example

Example 1: javascript remove property from object

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

Example 2: how to remove property of object in javascript without delete

const names = {
  father: "Johnny",
  brother: "Billy",
  sister: "Sandy"
}

delete names.father
// { brother: "Billy", sister: "Sandy" }

delete names["father"]
// { brother: "Billy", sister: "Sandy" }