This site is mobile accessible. Press the "Tap Here" button to use a smaller font-size.

Smartphone icons created by Freepik - Flaticon

JS Object Properties

Deleting object properties.

const person = {
  firstname: "John",
  lastname: "Doe",
  age: 50,
  eyecolor: "blue"
};

delete person.age;

document.getElementById("demo").innerHTML =
person.firstname + " is " + person.age + " years old.";