How do you check if a variable is an array in JavaScript? [duplicate]

Answer 1

This is an old question but having the same problem i found a very elegant solution that i want to share.

Adding a prototype to Array makes it very simple

Array.prototype.isArray = true;

Now once if you have an object you want to test to see if its an array all you need is to check for the new property

var box = doSomething();

if (box.isArray) {
    // do something
}

isArray is only available if its an array