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This feature is well established and works across many devices and browser versions. Its been available across browsers since 2015 ..
map() .
const new_array = arr.map(function callback( currentValue[, index[, array]]) {
// new_array
}[, thisArg])
callback, arr. , callback , new_array.
callback, , :
currentValue.
index.
array, .
thisArg . , this callback
, callback .
map callback , . callback , , undefined. ( , , .
callback : , , .
map thisArg, callback this. this undefined. , this, callback, this, .
map , ( callback ).
, map, callback. , map, callback. callback, , , , map ; .
, .
const numbers = [1, 4, 9];
const roots = numbers.map(Math.sqrt);
// roots [1, 2, 3], numbers [1, 4, 9]
, , . , map .
const numbers = [1, 4, 9];
const doubles = numbers.map((num) => num * 2);
// doubles [2, 8, 18], numbers [1, 4, 9]
map , map String ASCII, :
const map = Array.prototype.map;
const charCodes = map.call("Hello World", (x) => x.charCodeAt(0));
// charCodes [72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100]
map querySelectorAll , , querySelectorAll. :
const elems = document.querySelectorAll("select option:checked");
const values = Array.prototype.map.call(elems, ({ value }) => value);
map const string = "12345";
const reversed = Array.prototype.map
.call(string, (x) => x)
.reverse()
.join("");
// reversed '54321'
// : '===' ,
String.split() (. split()).
- (, ). , . .
// :
["1", "2", "3"].map(parseInt);
// [1, 2, 3],
// [1, NaN, NaN]
// parseInt , .
// , - .
// callback Array.prototype.map 3 :
// , .
// parseInt, , ,
// . .
const returnInt = (element) => parseInt(element, 10);
["1", "2", "3"].map(returnInt);
// ( )
// " !?":
["1", "2", "3"].map(Number); // [1, 2, 3]
| Specification |
|---|
| ECMAScript 2027 LanguageSpecification # sec-array.prototype.map |
This page was last modified on 29 . 2026 . 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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