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ALT /** * First, create a type helper that represents * the Result that we'll get from our safe function */ type Result<T> = | { ok: true; value: T; } | { ok: false; error: unknown; };
![/**
* Next, make a function that wraps the function
* you pass it with a try/catch, then executes it
*/
export const makeSafe =
<TArgs extends any[], TReturn>(
func: (...args: TArgs) => TReturn
) =>
(...args: TArgs): Result<TReturn> => {
try {
return {
value: func(...args),
ok: true,
};
} catch (e) {
return {
error: e,
ok: false,
};
}
};](https://venexa.site/media/FqnO5uhXgAE_lZ9.jpg)
ALT /** * Next, make a function that wraps the function * you pass it with a try/catch, then executes it */ export const makeSafe = <TArgs extends any[], TReturn>( func: (...args: TArgs) => TReturn ) => (...args: TArgs): Result<TReturn> => { try { return { value: func(...args), ok: true, }; } catch (e) { return { error: e, ok: false, }; } };
ALT /** * Wrap any function you want to error check with this * makeSafe wrapper */ const randomlyFail = makeSafe((input: number) => { if (input > 0.5) { throw new Error("oops"); } return { input, }; });
ALT /** * Finally, you can call it - and it'll return the error * if it fails, or the value if it succeeds */ const result = randomlyFail(0.25); if (result.ok) { result.value; // { input: number } } else { result.error; // unknown }
