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result decoder #35

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mulias
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@mulias mulias commented Jan 26, 2019

  • Improve how error messages are constructed when a decoder fails. I still don't love it, but it's a step in the right direction.
  • Add decoders and utilities to help with managing imperfect data. The result decoder introduces a composable way to let parts of a decoder fail, without failing the full decoder. The Result.errors and Decoder.mapError utilities help work with the result decoder.
  • Provide an example of how these tools can be used to validate an array of data, filtering out and logging failures.

Elias Mulhall added 7 commits January 26, 2019 16:45
[cleanup] Format with prettier
d22a1c3
[refactor] Remove unneeded type annotations
d5ab99f
[refactor] Pass down a Context for error reporting, export DecoderResult
b3a658a
Add result decoder
1635888 
Decoder to prevent error propagation. Always succeeds, but instead of
returning the decoded value, return a `Result` object containing either
the successfully decoded value, or the decoder failure error.
Add Result.errors utility
6a4cbe6 
Counterpart to Result.successes
Add mapError decoder method
69d6a62
Add logged decoder failures test example
697ae94
@mulias mulias force-pushed the em/result-decoder branch from 57d15c1 to 697ae94 Compare January 27, 2019 02:15
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