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This feature is well established and works across many devices and browser versions. Its been available across browsers since 2015 ..
Array.isArray() true, false, .
Array.isArray(obj)
obj.
true Array; , false.
// true
Array.isArray([]);
Array.isArray([1]);
Array.isArray(new Array());
// : Array.prototype :
Array.isArray(Array.prototype);
// false
Array.isArray();
Array.isArray({});
Array.isArray(null);
Array.isArray(undefined);
Array.isArray(17);
Array.isArray("Array");
Array.isArray(true);
Array.isArray(false);
Array.isArray({ __proto__: Array.prototype });
instanceof vs isArray Array, Array.isArray , instanceof, iframes.
var iframe = document.createElement("iframe");
document.body.appendChild(iframe);
xArray = window.frames[window.frames.length - 1].Array;
var arr = new xArray(1, 2, 3); // [1,2,3]
// Correctly checking for Array
Array.isArray(arr); // true
// Considered harmful, because doesn't work through iframes
arr instanceof Array; // false
Array.isArray(), .
if (!Array.isArray) {
Array.isArray = function (arg) {
return Object.prototype.toString.call(arg) === "[object Array]";
};
}
| Specification |
|---|
| ECMAScript 2027 LanguageSpecification # sec-array.isarray |
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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