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This feature is well established and works across many devices and browser versions. Its been available across browsers since 2023 ..
with() Array , . .
arrayInstance.with(index, value)
index, , .
-array.length <= index < 0, index + array.length.RangeError.value.
, index value.
RangeError, index >= array.length index < -array.length.
with() , . . .
with() at(), .
with() . , undefined.
with() . , this length .
const arr = [1, 2, 3, 4, 5];
console.log(arr.with(2, 6)); // [1, 2, 6, 4, 5]
console.log(arr); // [1, 2, 3, 4, 5]
with() , .
const arr = [1, 2, 3, 4, 5];
console.log(arr.with(2, 6).map((x) => x ** 2)); // [1, 4, 36, 16, 25]
with() .
const arr = [1, , 3, 4, , 6];
console.log(arr.with(0, 2)); // [2, undefined, 3, 4, undefined, 6]
with() . length , length. this , , . index value.
const arrayLike = {
length: 3,
unrelated: "foo",
0: 5,
2: 4,
3: 3, // , 3
};
console.log(Array.prototype.with.call(arrayLike, 0, 1));
// [ 1, undefined, 4 ]
| Specification |
|---|
| ECMAScript 2027 LanguageSpecification # sec-array.prototype.with |
Array.prototype.with core-jsArray.prototype.toReversed()Array.prototype.toSorted()Array.prototype.toSpliced()Array.prototype.at()TypedArray.prototype.with()This page was last modified on 4 . 2025 . by MDN contributors.
ArrayArray.prototype.at()Array.prototype.concat()Array.prototype.copyWithin()Array.prototype.entries()Array.prototype.every()Array.prototype.fill()Array.prototype.filter()Array.prototype.find()Array.prototype.findIndex()findLast()findLastIndex()Array.prototype.flat()Array.prototype.flatMap()Array.prototype.forEach()Array.prototype.includes()Array.prototype.indexOf()Array.prototype.join()Array.prototype.keys()Array.prototype.lastIndexOf()Array.prototype.map()Array.prototype.pop()Array.prototype.push()Array.prototype.reduce()Array.prototype.reduceRight()Array.prototype.reverse()Array.prototype.shift()Array.prototype.slice()Array.prototype.some()Array.prototype.sort()Array.prototype.splice()Array.prototype.toLocaleString()Array.prototype.toReversed()Array.prototype.toSorted()toSpliced()Array.prototype.toString()Array.prototype.unshift()Array.prototype.values()Array.prototype.with()Array.prototype[@@iterator]()Object/FunctionObject.prototype.__defineGetter__()Object.prototype.__defineSetter__()Object.prototype.__lookupGetter__()Object.prototype.__lookupSetter__()Object.prototype.hasOwnProperty()Object.prototype.isPrototypeOf()Object.prototype.propertyIsEnumerable()Object.prototype.toLocaleString()Object.prototype.toString()Object.prototype.valueOf()Your blueprint for a better internet.
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