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javascriptexceptionerror-handlingthrow

How to throw InvalidArgumentException JavaScript?

Objective

Throw InvalidArgumentException in a JavaScript method like one does in Java or similar languages.

Background

I have been trying to familiarize myself with JavaSctipt error handling, and I know I can throw exceptions using the throw keyword.

To achieve this, I read the throw documentation on MDN and the Error documentation on MDN as well.

Problem

So far this is my code:

if (mySize >= myArray.length)
    throw new Error("InvalidArgumentExcpetion - BANG!!!!");

This code has some problems for me:

  1. I have the text in the exception itself. Right now I have BANG, but tomorrow I may want BONG and if I decide to change it, I have to look everywhere!
  2. I am using an Error, and not really a new object with the type InvalidArgumentExcpetion. Is this the correct way?

Questions

So now I am confused.

  1. Should I create a new object like in the throw documentation, or create an Error Message?
  2. Doesn't JavaScript have a InvalidArgumentException object that I can use?
  3. How should I proceed in order to have a maintainable way to throw errors that uses ECMA6?
Solution

  • After doing research, I now have come down to a solution that I like. Special kudos to Toan, I would gladly chose his answer, but since I do feel that it is still a little bit incomplete, I decided to create my own answer with my own findings. Hope it helps someone !

    Problems:

    1. Using the solution proposed by Toan: https://stackoverflow.com/a/38146237/1337392

    2. It is a possible, albeit if you want customization you do need to create your own object.

    Answers:

    1. If you want to handle exceptions based on their types like in Java, you should create a new object like in the document. (by Toan Nguyen)
    2. Javascript does not have InvalidArgumentException (by Toan Nguyen)
    3. After reasearching, this solution is the one I found: https://stackoverflow.com/a/32750746/1337392

    Credits:

    • Toan Nguyen, for the first answers and his great ideas
    • David Wickström, for suggesting an article that led to an article that led to a blog where the answer I was looking for was.

    Thanks for all the help guys! kudos++ for all!