diff options
| -rw-r--r-- | gen/src/list.erl | 17 | ||||
| -rw-r--r-- | gen/test/list_test.erl | 7 | ||||
| -rw-r--r-- | src/list.gleam | 10 | ||||
| -rw-r--r-- | test/list_test.gleam | 11 |
4 files changed, 43 insertions, 2 deletions
diff --git a/gen/src/list.erl b/gen/src/list.erl index b606f22..9c26eba 100644 --- a/gen/src/list.erl +++ b/gen/src/list.erl @@ -1,7 +1,7 @@ -module(list). -compile(no_auto_import). --export([length/1, reverse/1, is_empty/1, contains/2, head/1, tail/1, filter/2, map/2, traverse/2, drop/2, take/2, new/0, append/2, flatten/1, fold/3, fold_right/3, find/2]). +-export([length/1, reverse/1, is_empty/1, contains/2, head/1, tail/1, filter/2, map/2, traverse/2, drop/2, take/2, new/0, append/2, flatten/1, fold/3, fold_right/3, find/2, all/2]). length(A) -> erlang:length(A). @@ -171,3 +171,18 @@ find(Haystack, F) -> find(Rest, F) end end. + +all(List, F) -> + case List of + [] -> + true; + + [X | Rest] -> + case F(X) of + true -> + all(Rest, F); + + _ -> + false + end + end. diff --git a/gen/test/list_test.erl b/gen/test/list_test.erl index 2505a6e..adf4ea2 100644 --- a/gen/test/list_test.erl +++ b/gen/test/list_test.erl @@ -1,7 +1,7 @@ -module(list_test). -compile(no_auto_import). --export([length_test/0, reverse_test/0, is_empty_test/0, contains_test/0, head_test/0, tail_test/0, filter_test/0, map_test/0, traverse_test/0, drop_test/0, take_test/0, new_test/0, append_test/0, flatten_test/0, fold_test/0, fold_right_test/0, find_test/0]). +-export([length_test/0, reverse_test/0, is_empty_test/0, contains_test/0, head_test/0, tail_test/0, filter_test/0, map_test/0, traverse_test/0, drop_test/0, take_test/0, new_test/0, append_test/0, flatten_test/0, fold_test/0, fold_right_test/0, find_test/0, all_test/0]). length_test() -> expect:equal(list:length([]), 0), @@ -93,3 +93,8 @@ find_test() -> expect:equal(list:find([1, 2, 3], F), {ok, 4}), expect:equal(list:find([1, 3, 2], F), {ok, 4}), expect:is_error(list:find([1, 3], F)). + +all_test() -> + expect:equal(list:all([1, 2, 3, 4, 5], fun(X) -> X > 0 end), true), + expect:equal(list:all([1, 2, 3, 4, 5], fun(X) -> X < 0 end), false), + expect:equal(list:all([], fun(_) -> false end), true). diff --git a/src/list.gleam b/src/list.gleam index 22da117..ccc674b 100644 --- a/src/list.gleam +++ b/src/list.gleam @@ -158,3 +158,13 @@ pub fn find(haystack, f) { } } +pub fn all(list, f) { + case list { + | [] -> True + | [x | rest] -> + case f(x) { + | True -> all(rest, f) + | _ -> False + } + } +} diff --git a/test/list_test.gleam b/test/list_test.gleam index c0a16ae..a24c7b8 100644 --- a/test/list_test.gleam +++ b/test/list_test.gleam @@ -162,3 +162,14 @@ pub fn find_test() { |> list:find(_, f) |> expect:is_error } + +pub fn all_test() { + list:all([1,2,3,4,5], fn(x) { x > 0 }) + |> expect:equal(_, True) + + list:all([1,2,3,4,5], fn(x) { x < 0 }) + |> expect:equal(_, False) + + list:all([], fn(_) { False }) + |> expect:equal(_, True) +} |