The Object hasOwnProperty() method
Find out all about the JavaScript hasOwnProperty() method of an object
Called on an object instance, accepts a string as argument. If the object has a property with the name contained in the string argument, it returns true. Otherwise it returns false.
Example:
const person = { name: 'Fred', age: 87 }
person.hasOwnProperty('name') //true
person.hasOwnProperty('job') //false
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