javscript remove a property

1var target = document.getElementById("p12");
2target.removeAttribute("class");

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

1var myObject = {
2    "name": "jon",
3    "gender": "male",
4    "registered": "yes"
5};
6delete myObject.gender;
7
8console.log(myObject);
9
10//other methods
11delete myObject.gender;
12// or,
13delete myObject['gender'];
14// or,
15var prop = "gender";
16delete myObject[prop];

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"}

1delete obj.firstname;