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Jan Küster
Jan Küster

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JavaScript one-liner puzzle: throw an error without using throw

#javascript #puzzle #fundamentals #beginners

Write a function that throws an error. Contstraints:

  • do not use throw
  • one line only
  • simply returning an Error is not sufficient (since it's not thrown)
  • function declaration must not throw the error, only execution should throw
  • Syntax error is not allowed!
  • max. ovarall characters for the code: 15

Tips:

  • the function is not something you should ever use in your code
  • think of fundamentals and what you learned about them
  • it's marked #beginners, because it's way easier than you might think
  • you can make pretty weird things with JavaScript

Top comments (2)

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thormeier profile image
Pascal Thormeier •

Uuh, love me some code golf!

Shortest implementation of any error I could think of would be something like this:

let e=_=>_._
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12 characters.

And then using it like so:

try {
  e()
} catch (err) {
  console.warn('error thrown', err)
}
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Throws Cannot read properties of undefined (reading '_'), though there's no error if the function receives an object as argument with _ defined.

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jankapunkt profile image
Jan Küster •

Without depending on the input but more lines

Spoiler 
const f=()=>f=0
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