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Implement List.map4

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Kevin Sjöberg 2021-10-31 08:08:24 +01:00
parent b29a029a33
commit f9ed060e49
16 changed files with 419 additions and 16 deletions
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6
compiler/builtins/docs/List.roc
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@ -25,6 +25,7 @@ interface List
map,
map2,
map3,
map4,
mapWithIndex,
mapOrDrop,
mapJoin,
@ -269,6 +270,11 @@ map2 : List a, List b, (a, b -> c) -> List c
## Repeat until a list runs out of elements.
map3 : List a, List b, List c, (a, b, c -> d) -> List d
## Run a transformation function on the first element of each list,
## and use that as the first element in the returned list.
## Repeat until a list runs out of elements.
map4 : List a, List b, List c, List d, (a, b, c, d -> e) -> List e
## This works like [List.map], except it also passes the index
## of the element to the conversion function.
mapWithIndex : List before, (before, Nat -> after) -> List after