The Object propertyIsEnumerable() method
Find out all about the JavaScript propertyIsEnumerable() 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, and that property is enumerable, it returns true. Otherwise it returns false.
Example:
const person = { name: 'Fred' }
Object.defineProperty(person, 'age', {
value: 87,
enumerable: false
})
person.propertyIsEnumerable('name') //true
person.propertyIsEnumerable('age') //false
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