Array.prototype.keys()

keys() 메서드는 배열의 각 인덱스를 키 값으로 가지는 새로운 Array Iterator 객체를 반환합니다.

구문

arr.keys()

반환 값

새로운 Array 반복기 객체.

예제

키 반복기는 빈 인덱스를 무시하지 않음

var arr = ['a', , 'c'];
var sparseKeys = Object.keys(arr);
var denseKeys = [...arr.keys()];
console.log(sparseKeys); // ['0', '2']
console.log(denseKeys);  // [0, 1, 2]

명세

Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Array.prototype.keys' in that specification.		 Standard Initial definition.
ECMAScript Latest Draft (ECMA-262)
The definition of 'Array.prototype.keys' in that specification.		 Draft  

브라우저 호환성

Update compatibility data on GitHub
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ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
keysChrome Full support 38Edge Full support 12Firefox Full support 28IE No support NoOpera Full support 25Safari Full support 8WebView Android Full support YesChrome Android Full support YesFirefox Android Full support 28Opera Android Full support YesSafari iOS Full support 8Samsung Internet Android Full support Yesnodejs Full support 0.12

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관련 주제
  1. Standard built-in objects
  2. Array
  3. Properties
    1. Array.length
    2. Array.prototype
    3. 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
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  11. Methods
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    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
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    8. Object.prototype.toLocaleString()
    9. Object.prototype.toSource() [Translate]
    10. Object.prototype.toString()
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    12. Object.prototype.valueOf()
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    14. Object.setPrototypeOf()