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feat: add List.findIndex, List.zip, List.flatten, List.contains

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Add missing List operations requested by ergon game engine project:
- findIndex(list, predicate) -> Option<Int>
- zip(list1, list2) -> List<(A, B)>
- flatten(listOfLists) -> List<A>
- contains(list, element) -> Bool

Resolves ergon porting blocker #4.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Brandon Lucas
2026-02-20 16:40:32 -05:00
parent 26b94935e9
commit 7b40421a6a
3 changed files with 202 additions and 7 deletions
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34
src/types.rs
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@@ -1539,6 +1539,16 @@ impl TypeEnv {
Type::Option(Box::new(Type::var())),
),
),
(
"findIndex".to_string(),
Type::function(
vec![
Type::List(Box::new(Type::var())),
Type::function(vec![Type::var()], Type::Bool),
],
Type::Option(Box::new(Type::Int)),
),
),
(
"any".to_string(),
Type::function(
@@ -1603,6 +1613,30 @@ impl TypeEnv {
)
},
),
(
"zip".to_string(),
Type::function(
vec![
Type::List(Box::new(Type::var())),
Type::List(Box::new(Type::var())),
],
Type::List(Box::new(Type::Tuple(vec![Type::var(), Type::var()]))),
),
),
(
"flatten".to_string(),
Type::function(
vec![Type::List(Box::new(Type::List(Box::new(Type::var()))))],
Type::List(Box::new(Type::var())),
),
),
(
"contains".to_string(),
Type::function(
vec![Type::List(Box::new(Type::var())), Type::var()],
Type::Bool,
),
),
]);
env.bind("List", TypeScheme::mono(list_module_type));