Delete operator
The delete operator deletes a binding (duh)
let anObject = {left: 1, right: 2};
console.log(anObject.left);
delete anObject.left;
console.log(anObject.left);
console.log("left" in anObject);
console.log("right" in anObject);In operator
The in operator tells you whether and object has a property with that
name
let Object = {
thisPropertyExists: true
}
console.log("thisPropertyExists" in Object)
console.log("thisPropertyDoesNotExist" in Object)