propertyIsEnumerable Property
Returns a Boolean value indicating whether a specified property is part of an object and if it is enumerable.
object.propertyIsEnumerable(propName)
The propertyIsEnumerable property returns true if propName exists in object and can be enumerated using a For...In loop. The propertyIsEnumerable property returns false if object does not have a property of the specified name or if the specified property is not enumerable. Typically, predefined properties are not enumerable while user-defined properties are always enumerable.
The propertyIsEnumerable property does not consider objects in the prototype chain.
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