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propertyIsEnumerable() 메소드는 특정 속성이 열거가능한지 여부를 나타내는 Boolean을 반환합니다.

구문

obj.propertyIsEnumerable(prop)

매개변수

prop
테스트 할 속성의 이름.

반환 값

특정 속성이 열거가능한지 여부를 나타내는 Boolean.

설명

Every object has a propertyIsEnumerable method. This method can determine whether the specified property in an object can be enumerated by a for...in loop, with the exception of properties inherited through the prototype chain. If the object does not have the specified property, this method returns false.

예제

A basic use of propertyIsEnumerable

The following example shows the use of propertyIsEnumerable on objects and arrays:

var o = {};
var a = [];
o.prop = 'is enumerable';
a[0] = 'is enumerable';

o.propertyIsEnumerable('prop');   // returns true
a.propertyIsEnumerable(0);        // returns true

User-defined versus built-in objects

The following example demonstrates the enumerability of user-defined versus built-in properties:

var a = ['is enumerable'];

a.propertyIsEnumerable(0);          // returns true
a.propertyIsEnumerable('length');   // returns false

Math.propertyIsEnumerable('random');   // returns false
this.propertyIsEnumerable('Math');     // returns false

Direct versus inherited properties

var a = [];
a.propertyIsEnumerable('constructor');         // returns false

function firstConstructor() {
  this.property = 'is not enumerable';
}

firstConstructor.prototype.firstMethod = function() {};

function secondConstructor() {
  this.method = function method() { return 'is enumerable'; };
}

secondConstructor.prototype = new firstConstructor;
secondConstructor.prototype.constructor = secondConstructor;

var o = new secondConstructor();
o.arbitraryProperty = 'is enumerable';

o.propertyIsEnumerable('arbitraryProperty');   // returns true
o.propertyIsEnumerable('method');              // returns true
o.propertyIsEnumerable('property');            // returns false

o.property = 'is enumerable';

o.propertyIsEnumerable('property');            // returns true

// These return false as they are on the prototype which 
// propertyIsEnumerable does not consider (even though the last two
// are iteratable with for-in)
o.propertyIsEnumerable('prototype');   // returns false (as of JS 1.8.1/FF3.6)
o.propertyIsEnumerable('constructor'); // returns false
o.propertyIsEnumerable('firstMethod'); // returns false

스펙

Specification Status Comment
ECMAScript 3rd Edition (ECMA-262) Standard Initial definition
ECMAScript 5.1 (ECMA-262)
The definition of 'Object.prototype.propertyIsEnumerable' in that specification.
Standard  
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Object.prototype.propertyIsEnumerable' in that specification.
Standard  
ECMAScript Latest Draft (ECMA-262)
The definition of 'Object.prototype.propertyIsEnumerable' in that specification.
Draft  

브라우저 호환성

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) (Yes)[1] (Yes) (Yes) (Yes)
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) (Yes)[1] (Yes) (Yes) (Yes)

[1] Starting in JavaScript 1.8.1 (in Gecko 1.9.2 (Firefox 3.6 / Thunderbird 3.1 / Fennec 1.0)), propertyIsEnumerable('prototype') returns false instead of true; this makes the result compliant with ECMAScript 5.

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