How to tell if an attribute exists on an object
const user = {
name: "Sicrano",
age: 14
}
user.hasOwnProperty('name'); // Retorna true
user.hasOwnProperty('age'); // Retorna true
user.hasOwnProperty('gender'); // Retorna false
user.hasOwnProperty('address'); // Retorna falsehow to check wether the property exist in a object in java script
if (obj.hasOwnProperty('prop')) {
// do something
}check the properties of an object in javascript
for (var name in object) {
if (object.hasOwnProperty(name)) {
// do something with name
}
}
// OR
const hero = {
name: 'Batman'
};
hero.hasOwnProperty('name'); // => true
hero.hasOwnProperty('realName'); // => falsetest if property exists javascript
const hero = {
name: 'Batman'
};
hero.hasOwnProperty('name'); // => true
hero.hasOwnProperty('realName'); // => falsecheck if property exists javascript
// the coolest way
const obj = {
weather: 'Sunny;
}
if('weather' in obj) {
// do something
}Copyright © 2021 Codeinu
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