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feat: Add mapErrors to Result #884

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feat: Add mapErrors to Result #884

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297daa1
Add mapErrors to Result
didrikmunther Dec 16, 2024
c4805e0
Add mapErrors to result export
didrikmunther Dec 16, 2024
8f1c044
Add mapMap to mapErrors
didrikmunther Dec 17, 2024
e2ae324
Add tests and rename mapErrors to mapErrorsKeepIdentities
didrikmunther Dec 17, 2024
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16 changes: 16 additions & 0 deletions stdlib/result.mc
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Original file line number Diff line number Diff line change
Expand Up @@ -149,6 +149,21 @@ let _mergeErrors
= lam a. lam b.
{ warnings = mapUnion a.warnings b.warnings, errors = mapUnion a.errors b.errors }

-- Map the errors, if any, inside the `Result`. Preserves all warnings.
let _mapErrorsKeepIdentities
: all w. all e1. all e2. all a. (e1 -> e2) -> Result w e1 a -> Result w e2 a
= lam f. lam start.
switch start
case ResultOk r then ResultOk r
case ResultErr { warnings = warnings, errors = errors } then
ResultErr { warnings = warnings, errors = mapMap f errors }
end

utest match _prepTest (_mapErrorsKeepIdentities (addi 1) (_err 3)) with ([], Left [4]) then true else false
with true
utest match _prepTest (_mapErrorsKeepIdentities (addi 1) (_ok 3)) with ([], Right 3) then true else false
with true

-- Update the value, if any, inside the `Result`. Preserves all errors
-- and warnings.
let _map
Expand Down Expand Up @@ -695,6 +710,7 @@ let result =
, map3 = _map3
, map4 = _map4
, map5 = _map5
, mapErrorsKeepIdentities = _mapErrorsKeepIdentities
, apply = _apply
, withAnnotations = _withAnnotations
-- Mapping, action can produce new errors and/or warnings
Expand Down
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