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Add List.walk! function

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Ian McLerran 2024-12-30 13:34:26 -06:00
parent cb762688de
commit 53915bc6e1
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1 changed files with 12 additions and 0 deletions
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12
crates/compiler/builtins/roc/List.roc
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@ -1466,3 +1466,15 @@ forEachTry! = \list, func! ->
Err err ->
Err err
## Build a value from the contents of a list, using an effectful function.
##
## This is the same as [walk], except that the step function can have effects.
walk! : List elem, state, (state, elem => state) => state
walk! = \list, init, func! ->
when list is
[] -> state
[elem, .. as rest] ->
nextState = func! state elem
walk! rest nextState func!