propertyIsEnumerable Property

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

object.propertyIsEnumerable(propName)

Arguments

• object
  Required. Instance of an object.

• propName
  Required. String value of a property name.

Remarks

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.

Example

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 as follows:

true

Requirements

Version 5.5

Applies To:

Object Object

See Also

Other Resources

Properties (Visual Studio - JScript)

Change History