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Custom errors, extending Error by ockley · Pull Request #275 · javascript-tutorial/da.javascript.info · GitHub

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Custom errors, extending Error #275

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Merged
ockley merged 1 commit into from
Mar 20, 2026
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Custom errors, extending Error #275

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        • solution.md
        • task.md
      • article.md
    • index.md
4 changes: 2 additions & 2 deletions 1-js/10-error-handling/2-custom-errors/1-format-error/solution.md
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Original file line number Diff line number Diff line change
Expand Up @@ -6,9 +6,9 @@ class FormatError extends SyntaxError {
}
}

let err = new FormatError("formatting error");
let err = new FormatError("formattingsfejl");

alert( err.message ); // formatting error
alert( err.message ); // formatteringsfejl
alert( err.name ); // FormatError
alert( err.stack ); // stack

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14 changes: 7 additions & 7 deletions 1-js/10-error-handling/2-custom-errors/1-format-error/task.md
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Expand Up @@ -2,21 +2,21 @@ importance: 5

---

# Inherit from SyntaxError
# Nedarv fra SyntaxError

Create a class `FormatError` that inherits from the built-in `SyntaxError` class.
Opret en klasse `FormatError` som nedarver fra den indbyggede `SyntaxError`-klasse.

It should support `message`, `name` and `stack` properties.
Den bør understøtte `message`, `name` og `stack` egenskaber.

Usage example:
Brugseksempel:

```js
let err = new FormatError("formatting error");
let err = new FormatError("formatteringsfejl");

alert( err.message ); // formatting error
alert( err.message ); // formatteringsfejl
alert( err.name ); // FormatError
alert( err.stack ); // stack

alert( err instanceof FormatError ); // true
alert( err instanceof SyntaxError ); // true (because inherits from SyntaxError)
alert( err instanceof SyntaxError ); // true (fordi den nedarver fra SyntaxError)
```
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