javascript does object have property
const object1 = new Object();
object1.property1 = 42;
console.log(object1.hasOwnProperty('property1'));
// expected output: true
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var person = {'first_name': 'bill','age':20};<br/><br/>if ( person.hasOwnProperty('first_name') ) {<br/> //person has a first_name property<br/>}<br/>
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