26 lines
805 B
Markdown
26 lines
805 B
Markdown
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# 28-haskell-applicative-validation
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This example shows intermediate Haskell validation with an Applicative error accumulator.
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It includes:
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- a custom `Validation` type that accumulates multiple errors,
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- a release manifest built from validated fields,
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- a CLI that reports all invalid fields at once, and
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- a test suite run by `nix flake check`.
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Useful commands:
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```bash
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nix develop
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cabal run
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cabal run -- service=api-gateway env=production owners=platform,security replicas=3 strategy=canary:20 window=22-24
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cabal test
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nix build
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./result/bin/mini-validation service=api-gateway env=production owners=platform,security replicas=3 strategy=canary:20 window=22-24
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nix run . -- service=api-gateway env=production owners=platform,security replicas=3 strategy=canary:20 window=22-24
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nix flake check
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```
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