check if js property exists in class

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Bryden
10 May 2017
1const hero = {
2  name: 'Batman'
3};
4
5hero.hasOwnProperty('name');     // => true
6hero.hasOwnProperty('realName'); // => false
source
Ignacio
20 Mar 2020
1myObj.hasOwnProperty(myProp)
source
Malik
04 Jan 2019
1var person = {'first_name': 'bill','age':20};
2
3if ( person.hasOwnProperty('first_name') ) {
4    //person has a first_name property
5}
6
Elisa
30 Oct 2017
1// the coolest way
2const obj = {
3 weather: 'Sunny; 
4}
5
6if('weather' in obj) {
7 // do something 
8}
9
10
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