26 lines
806 B
Markdown
26 lines
806 B
Markdown
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# 29-haskell-foldmap-summary
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This example shows intermediate Haskell aggregation with `foldMap` and monoids.
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It includes:
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- a structured deployment event type,
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- a summary type built from monoidal fields,
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- one `foldMap` pass that aggregates several useful metrics, 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 -- api:production:succeeded:3:platform,security worker:staging:failed-db-lock:1:ops ui:production:cancelled:2:frontend
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cabal test
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nix build
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./result/bin/mini-summary api:production:succeeded:3:platform,security worker:staging:failed-db-lock:1:ops ui:production:cancelled:2:frontend
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nix run . -- api:production:succeeded:3:platform,security worker:staging:failed-db-lock:1:ops ui:production:cancelled:2:frontend
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nix flake check
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```
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