Array.prototype[@@unscopables]

@@unscopable 기호 속성은 ES2015 이전 ECMAScript 표준에 포함되지 않은 속성 이름을 포함합니다. 해당 속성들은 with 바인딩에서 제외됩니다.

구문

arr[Symbol.unscopables]

설명

with 바인딩에서 제외되는 배열의 기본 속성은 copyWithin, entries, fill, find, findIndex, includes, keys, values입니다.

자신의 객체에 대해 unscopables를 설정하는 방법은 Symbol.unscopables를 참고하세요.

Property attributes of Array.prototype[@@unscopables]
Writable no
Enumerable no
Configurable yes

예제

아래 코드는 ES5 이하에서 잘 작동합니다. 그러나 ECMAScript 2015 이후 Array.prototype.keys() 메서드가 도입되었습니다. 이는 with 내부에서 "keys"가 변수가 아니라 메서드임을 의미합니다. 여기서 Array.prototype[@@unscopables]가 개입하여 일부 배열 메서드가 with 범위에 묶이는 일을 방지합니다.

var keys = [];

with (Array.prototype) {
  keys.push("something");
}

Object.keys(Array.prototype[Symbol.unscopables]); 
// ["copyWithin", "entries", "fill", "find", "findIndex", 
//  "includes", "keys", "values"]

명세

Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Array.prototype[@@unscopables]' in that specification.		 Standard Initial definition.
ECMAScript (ECMA-262)
The definition of 'Array.prototype[@@unscopables]' in that specification.		 Living Standard  

브라우저 호환성

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
@@unscopablesChrome Full support 38Edge Full support 12Firefox Full support 48IE No support NoOpera Full support 25Safari Full support 10WebView Android Full support 38Chrome Android Full support 38Firefox Android Full support 48Opera Android Full support 25Safari iOS Full support 10Samsung Internet Android Full support 3.0nodejs Full support 0.12

Legend

Full support  
Full support
No support  
No support

같이 보기

관련 주제
  1. Standard built-in objects
  2. Array
  3. Properties
    1. Array.length
    2. Array.prototype[@@unscopables]
  4. Methods
    1. Array.from()
    2. Array.isArray()
    3. Array.observe()
    4. Array.of()
    5. Array.prototype.concat()
    6. Array.prototype.copyWithin()
    7. Array.prototype.entries()
    8. Array.prototype.every()
    9. Array.prototype.fill()
    10. Array.prototype.filter()
    11. Array.prototype.find()
    12. Array.prototype.findIndex()
    13. Array.prototype.flat()
    14. Array.prototype.flatMap()
    15. Array.prototype.forEach()
    16. Array.prototype.includes()
    17. Array.prototype.indexOf()
    18. Array.prototype.join()
    19. Array.prototype.keys()
    20. Array.prototype.lastIndexOf()
    21. Array.prototype.map()
    22. Array.prototype.pop()
    23. Array.prototype.push()
    24. Array.prototype.reduce()
    25. Array.prototype.reduceRight()
    26. Array.prototype.reverse()
    27. Array.prototype.shift()
    28. Array.prototype.slice()
    29. Array.prototype.some()
    30. Array.prototype.sort()
    31. Array.prototype.splice()
    32. Array.prototype.toLocaleString()
    33. Array.prototype.toSource()
    34. Array.prototype.toString()
    35. Array.prototype.unshift()
    36. Array.prototype.values()
    37. Array.prototype[@@iterator]()
    38. Array.unobserve() [Translate]
    39. get Array[@@species]
  5. Inheritance:
  6. Function
  7. Properties
    1. Function.arguments
    2. Function.arity [Translate]
    3. Function.caller [Translate]
    4. Function.displayName [Translate]
    5. Function.length
    6. Function.name
  8. Methods
    1. Function.prototype.apply()
    2. Function.prototype.bind()
    3. Function.prototype.call()
    4. Function.prototype.isGenerator() [Translate]
    5. Function.prototype.toSource()
    6. Function.prototype.toString() [Translate]
  9. Object
  10. Properties
    1. Object.prototype.__count__ [Translate]
    2. Object.prototype.__noSuchMethod__ [Translate]
    3. Object.prototype.__parent__ [Translate]
    4. Object.prototype.__proto__ [Translate]
    5. Object.prototype.constructor
  11. Methods
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__() [Translate]
    3. Object.prototype.__lookupGetter__() [Translate]
    4. Object.prototype.__lookupSetter__() [Translate]
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
    8. Object.prototype.toLocaleString()
    9. Object.prototype.toSource() [Translate]
    10. Object.prototype.toString()
    11. Object.prototype.unwatch() [Translate]
    12. Object.prototype.valueOf()
    13. Object.prototype.watch() [Translate]
    14. Object.setPrototypeOf()