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Showing content from https://webplatform.github.io/docs/javascript/Object/propertyIsEnumerable below:

propertyIsEnumerable · WebPlatform Docs

propertyIsEnumerable Summary

Determines whether a specified property is enumerable.

Syntax

propertyIsEnumerable( proName )

proName: Required. String value of a property name.

Examples

var a = new Array("apple", "banana", "cactus");
 document.write(a.propertyIsEnumerable(1));

Remarks

The propertyIsEnumerable method returns true if proName exists in object and can be enumerated using a For loop. The propertyIsEnumerable method 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, but user-defined properties are always enumerable.

The propertyIsEnumerable method does not consider objects in the prototype chain.