Answers for "delete in js"

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: undefined

js delete element

// delete an element from the dom
var elem = document.querySelector('#some-element');
elem.parentNode.removeChild(elem);


// keep element in dom
var elem = document.querySelector('#some-element');
elem.style.display = 'none';

javascript remove object key

var obj = {a: 5, b: 3};
delete obj["a"];
console.log(obj); // {b: 3}

nodejs delete object key

delete obj.firstname;

javascript remove function from object

var obj = {
  func: function(a, b) {
    return a + b;
  }
};
delete obj.func;
obj.func(); // Uncaught TypeError: obj.func is not a function

js delete

// JavaScript "delete"
const Employee = {
  firstname: 'John',
  lastname: 'Doe'
};

console.log(Employee.firstname);
// expected output: "John"

delete Employee.firstname;

console.log(Employee.firstname);
// expected output: undefined


// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/delete