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I want to throw some things in my JS code and I want them to be instanceof Error, but I also want to have them be something else.
In Python, typically, one would subclass Exception.
What's the appropriate thing to do in JS?
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JavaScript provides error-handling mechanism to catch runtime errors using try-catch-finally block, similar to other languages like Java or C#. try: wrap suspicious code that may throw an error in try block. catch: write code to do something in catch block when an error occurs.
It's best to avoid throwing errors from inside a Promise, because they may not always be caught, depending on how the code that called them is structured. However it's good practice to return an error when rejecting a Promise, and you can return Error custom types just like any other Error.
In ES6:
class MyError extends Error { constructor(message) { super(message); this.name = 'MyError'; } } source
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