how to delete in object 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: javascript remove object key
var obj = {a: 5, b: 3};
delete obj["a"];
console.log(obj); // {b: 3}
Example 3: nodejs delete object key
delete obj.firstname;