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  6. Array.prototype.toReversed()
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Array.prototype.toReversed()

20237

Array toReversed() reverse()

js
toReversed()

toReversed()

toReversed() undefined

toReversed() this length

items items items

js
const items = [1, 2, 3];
console.log(items); // [1, 2, 3]

const reversedItems = items.toReversed();
console.log(reversedItems); // [3, 2, 1]
console.log(items); // [1, 2, 3]

toReversed()

toReversed() undefined

js
console.log([1, , 3].toReversed()); // [3, undefined, 1]
console.log([1, , 3, 4].toReversed()); // [4, 3, undefined, 1]

toReversed()

toReversed() this length length - 1 0

js
const arrayLike = {
  length: 3,
  unrelated: "foo",
  2: 4,
};
console.log(Array.prototype.toReversed.call(arrayLike));
// [4, undefined, undefined]
// '0'  '1'  undefined

ECMAScript 2027 LanguageSpecification
# sec-array.prototype.toreversed

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  1. JavaScript
  2. Array
    1. Array()
    1. Array.from()
    2. Array.fromAsync()
    3. Array.isArray()
    4. Array.of()
    1. Array[Symbol.species]
    1. Array.prototype.at()
    2. Array.prototype.concat()
    3. Array.prototype.copyWithin()
    4. Array.prototype.entries()
    5. Array.prototype.every()
    6. Array.prototype.fill()
    7. Array.prototype.filter()
    8. Array.prototype.find()
    9. Array.prototype.findIndex()
    10. findLast()
    11. Array.prototype.findLastIndex()
    12. Array.prototype.flat()
    13. Array.prototype.flatMap()
    14. Array.prototype.forEach()
    15. Array.prototype.includes()
    16. Array.prototype.indexOf()
    17. Array.prototype.join()
    18. Array.prototype.keys()
    19. Array.prototype.lastIndexOf()
    20. Array.prototype.map()
    21. Array.prototype.pop()
    22. Array.prototype.push()
    23. Array.prototype.reduce()
    24. Array.prototype.reduceRight()
    25. Array.prototype.reverse()
    26. Array.prototype.shift()
    27. Array.prototype.slice()
    28. Array.prototype.some()
    29. Array.prototype.sort()
    30. Array.prototype.splice()
    31. Array.prototype.toLocaleString()
    32. Array.prototype.toReversed()
    33. Array.prototype.toSorted()
    34. Array.prototype.toSpliced()
    35. Array.prototype.toString()
    36. Array.prototype.unshift()
    37. Array.prototype.values()
    38. Array.prototype.with()
    39. Array.prototype[Symbol.iterator]()
    1. Arraylength
    2. Array.prototype[Symbol.unscopables]
  9. Object/Function
    1. Function.prototype.apply()
    2. Function.prototype.bind()
    3. Function.prototype.call()
    4. Function.prototype.toString()
    5. Function.prototype[Symbol.hasInstance]()
    1. Function.displayName
    2. Functionlength
    3. Function.name
    4. Function.prototype.prototype
    5. Function.prototype.arguments
    6. Function.prototype.caller
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__()
    3. Object.prototype.__lookupGetter__()
    4. Object.prototype.__lookupSetter__()
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
    8. Object.prototype.toLocaleString()
    9. Object.prototype.toString()
    10. Object.prototype.valueOf()
    1. Object.prototype.__proto__
    2. Object.prototype.constructor
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