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List.mapWithIndex

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This commit is contained in:
Folkert 2021-02-17 22:29:15 +01:00
parent 7bd228ca9b
commit 65ab08728a
11 changed files with 117 additions and 5 deletions
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12
compiler/builtins/src/std.rs
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@ -726,6 +726,18 @@ pub fn types() -> MutMap<Symbol, (SolvedType, Region)> {
),
);
// mapWithIndex : List before, (Nat, before -> after) -> List after
add_type(Symbol::LIST_MAP_WITH_INDEX, {
let_tvars! { cvar, before, after};
top_level_function(
vec![
list_type(flex(before)),
closure(vec![nat_type(), flex(before)], cvar, Box::new(flex(after))),
],
Box::new(list_type(flex(after))),
)
});
// append : List elem, elem -> List elem
add_type(
Symbol::LIST_APPEND,