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This feature is well established and works across many devices and browser versions. Its been available across browsers since 2015 ..
const elements = ["Fire", "Air", "Water"];
console.log(elements.join());
// Expected output: "Fire,Air,Water"
console.log(elements.join(""));
// Expected output: "FireAirWater"
console.log(elements.join("-"));
// Expected output: "Fire-Air-Water"
arr.join([separator])
separator , . . , ','. - , .
, . arr.length == 0, .
. undefined null .
a , : , , , , .
var a = ["", "", ""];
var myVar1 = a.join(); // ',,' myVar1
var myVar2 = a.join(", "); // ', , ' myVar2
var myVar3 = a.join(" + "); // ' + + ' myVar3
var myVar4 = a.join(""); // '' myVar4
( ) Function.prototype.call Array.prototype.join.
function f(a, b, c) {
var s = Array.prototype.join.call(arguments);
console.log(s); // '1,a,true'
}
f(1, "a", true);
| Specification |
|---|
| ECMAScript 2027 LanguageSpecification # sec-array.prototype.join |
This page was last modified on 17 . 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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