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propertyIsEnumerable Property

Returns a Boolean value indicating whether a specified property is part of an object and if it is enumerable.

object.propertyIsEnumerable(propName)

object

Required. Instance of an object.

propName

Required. String value of a property name.

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.

The following example illustrates the use of the propertyIsEnumerable property.

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

The output of this program is:

true

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