javascript hasownproperty
var person = {
"first_name": "Bob",
"last_name": "Dylan"
};
person.hasOwnProperty('first_name'); //returns true
person.hasOwnProperty('age'); //returns falsejavascript hasownproperty
var person = {
"first_name": "Bob",
"last_name": "Dylan"
};
person.hasOwnProperty('first_name'); //returns true
person.hasOwnProperty('age'); //returns falsehasOwnProperty
//
//2021 - Object.hasOwn as a replacement for Object.hasOwnProperty()
//As other answers indicated, hasOwnProperty will check for an object own properties in contrast to in which will also check for inherited properties.
//There is a new alternative method called Object.hasOwn() and is intended to be a replacement for Object.hasOwnProperty()**
const person = { name: 'dan' };
console.log(Object.hasOwn(person, 'name'));// true
console.log(Object.hasOwn(person, 'age'));// false
const person2 = Object.create({gender: 'male'});
console.log(Object.hasOwn(person2, 'gender'));// false
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