stackoverflow.com/questions/1098040/checking-if-a-key-exists-in-a-javascript-object
Checking if a key exists in a JavaScript object?
How do I check if a particular key exists in a JavaScript object or array? If a key doesn't exist, and I try to access it, will it return false? Or throw an error?
stackoverflow.com
www.javascripttutorial.net/object/javascript-check-if-property-exists/
3 Ways to Check If a Property Exists in an Object in JavaScript
How to check if a property exists in an object in JavaScript by using the hasOwnProperty() method, the in operator, and comparing with undefined.
www.javascripttutorial.net
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