How to check if an object is an array?

Question

I\'m trying to write a function that either accepts a list of strings, or a single string. If it\'s a string, then I want to convert it to an array with just the one item so

Answer 1

The following could be used if you know that your object doesn't have a concat method.

var arr = [];
if (typeof arr.concat === 'function') {
    console.log("It's an array");
}