How do I check if a variable is an array in JavaScript?

How do I check if a variable is an array in JavaScript?

You can use the Array.isArray() method to check if a variable is an array. For example:

let myVar = [1, 2, 3];
console.log(Array.isArray(myVar)); // true

Are there any other methods to check if a variable is an array?

Yes, you can also use the instanceof operator:

console.log(myVar instanceof Array); // true

However, Array.isArray() is the recommended method.

What if the variable is null or undefined?

If the variable is null or undefined, Array.isArray() will return false. It's a good practice to check for these cases before checking if it's an array.

Can you show me an example with null?

Sure! Here's an example:

let myVar = null;
console.log(Array.isArray(myVar)); // false