How to check object is an Array

 var arrayList = [1, 2, 3];

if (Object.prototype.toString.call(arrayList) == '[object Array]') {

console.log("It is an array")

} else {

console.log("It is not an array")

}

if (Array.isArray(arrayList)) {

console.log("It is an array")

} else {

console.log("It is not an array")

}

Output:

It is not an array It is not an array