The Object isExtensible() method
Find out all about the JavaScript isExtensible() method of the Object object
This method checks if we can add new properties to an object.
Any object is extensible, unless it’s been used as an argument to
Usage:
const dog = {}
Object.isExtensible(dog) //trueconst cat = {}
Object.freeze(cat)
Object.isExtensible(cat) //false
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