How can I check argument types in JavaScript?

How can I check argument types in JavaScript?

You can use the typeof operator to check the type of a variable. For example, typeof arg === 'string' checks if arg is a string.

What if I want to check for multiple types?

You can use an array of types and the Array.includes() method. For example: ['string', 'number'].includes(typeof arg).

Is there a way to check for custom object types?

Yes, you can use the instanceof operator for custom objects. For example, arg instanceof MyClass checks if arg is an instance of MyClass.

Can I create a utility function to check types?

Absolutely! You can create a function that takes an argument and an array of types to check against, returning true or false.