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adds recipe CapabilityPatternWithCheckedExceptions #262

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adds recipe CapabilityPatternWithCheckedExceptions #262

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afcondon Jan 5, 2021
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use the results from getPureScript
afcondon Jan 5, 2021
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add recipe to README.md
afcondon Jan 5, 2021
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tidy up and renaming, pointfree runApp
afcondon Jan 5, 2021
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Update README.md
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Update README.md
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Update README.md
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afcondon committed Jan 5, 2021
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5 changes: 2 additions & 3 deletions recipes/CapabilityPatternWithCheckedExceptionsNode/README.md
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Expand Up @@ -6,12 +6,11 @@ It's best to be completely familiar with the design and implementation of that r

Additionally, you should familiarize yourself with the [README](https://github.com/natefaubion/purescript-checked-exceptions) from `checked-exceptions`.


## Expected Behavior:

The `main` runs the `program` (see linked readme) in three successive, different monad contexts: `Aff`, `Effect` and `Test`.
The `main` runs the `program` in a specialized monadic context (`AppExcVM`) which provides `Reader`, `Aff` and `ExceptV` instances in addition to the _capabilities_ required by the `program`, namely ability to `log` and `getUserName`.

If you want to verify that a failing test would still terminate the process with an error, you can simply uncomment the second call to `Test.runApp`
In the implementation of `getUserName` we - somewhat artificially - use two additional services, each of which can give rise to a class of thrown errors / exceptions. We show how, provided these errors are all matched to error handling functions, the exceptions can be guaranteed not to escape from our monadic context.

### Node.js

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