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

object.propertyIsEnumerable(proName)

Arguments

object

Required. Instance of an object.

proName

Required. String value of a property name.

Remarks

The propertyIsEnumerable property returns true if proName 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

function testIsEnumerable(){
  var a = new Array("apple", "banana", "cactus");
  return(a.propertyIsEnumerable(1));
}

Requirements

Version 5.5

See Also

Applies To: Object Object