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));

 // Output: true

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.

See also

Specification

15.2.4.7 Object.prototype.propertyIsEnumerable (V) ECMAScript® Language Specification Standard ECMA-262 5.1 Edition / June 2011

Attributions

• Microsoft Developer Network: Article