javascript delete key from object
let person = {
firstname: 'John',
lastname: 'Doe'
}
console.log(person.firstname);
// expected output: "John"
delete person.firstname;
console.log(person.firstname);
// expected output: undefineddelete object.keyname;var obj = {a: 5, b: 3};
delete obj["a"];
console.log(obj); // {b: 3}delete obj.firstname;delete object.element;
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