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Home/ Questions/Q 8071101
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Editorial Team
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Editorial Team
Asked: June 5, 20262026-06-05T13:35:52+00:00 2026-06-05T13:35:52+00:00

There are some stdlib functions that throw errors on invalid input. For example: Prelude>

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There are some stdlib functions that throw errors on invalid input. For example:

Prelude> read "1o2" :: Int
*** Exception: Prelude.read: no parse

I would like to wrap it to return a Either e a instead. How can I do that?

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  1. Editorial Team
    Editorial Team
    2026-06-05T13:35:54+00:00Added an answer on June 5, 2026 at 1:35 pm

    There is no spoon. You didn’t hear it from me.

    For this particular example, though, you should use reads instead.

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