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| author | Robert Peterson <robert.peterson@gmail.com> | 2019-04-16 15:24:35 -0700 |
|---|---|---|
| committer | Louis Pilfold <louis@lpil.uk> | 2019-04-17 16:12:57 +0100 |
| commit | 469e88eef91320815d709ca79b512479b2427420 (patch) | |
| tree | f90d7274f300990c81c0bae80554287a5df8f3ad | |
| parent | 7275a9ef72e79bbf33a47abdb72b4596a10505d8 (diff) | |
| download | gleam_stdlib-469e88eef91320815d709ca79b512479b2427420.tar.gz gleam_stdlib-469e88eef91320815d709ca79b512479b2427420.zip | |
Add list:any
| -rw-r--r-- | gen/src/list.erl | 17 | ||||
| -rw-r--r-- | gen/test/list_test.erl | 7 | ||||
| -rw-r--r-- | src/list.gleam | 11 | ||||
| -rw-r--r-- | test/list_test.gleam | 11 |
4 files changed, 44 insertions, 2 deletions
diff --git a/gen/src/list.erl b/gen/src/list.erl index 9c26eba..97c0579 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, all/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, any/2]). length(A) -> erlang:length(A). @@ -186,3 +186,18 @@ all(List, F) -> false end end. + +any(List, F) -> + case List of + [] -> + false; + + [X | Rest] -> + case F(X) of + false -> + any(Rest, F); + + _ -> + true + end + end. diff --git a/gen/test/list_test.erl b/gen/test/list_test.erl index adf4ea2..df9acac 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, all_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, any_test/0]). length_test() -> expect:equal(list:length([]), 0), @@ -98,3 +98,8 @@ 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). + +any_test() -> + expect:equal(list:any([1, 2, 3, 4, 5], fun(X) -> X =:= 2 end), true), + expect:equal(list:any([1, 2, 3, 4, 5], fun(X) -> X < 0 end), false), + expect:equal(list:any([], fun(_) -> false end), false). diff --git a/src/list.gleam b/src/list.gleam index ccc674b..9293f50 100644 --- a/src/list.gleam +++ b/src/list.gleam @@ -168,3 +168,14 @@ pub fn all(list, f) { } } } + +pub fn any(list, f) { + case list { + | [] -> False + | [ x | rest] -> + case f(x) { + | False -> any(rest, f) + | _ -> True + } + } +} diff --git a/test/list_test.gleam b/test/list_test.gleam index a24c7b8..2afd9e2 100644 --- a/test/list_test.gleam +++ b/test/list_test.gleam @@ -173,3 +173,14 @@ pub fn all_test() { list:all([], fn(_) { False }) |> expect:equal(_, True) } + +pub fn any_test() { + list:any([1,2,3,4,5], fn(x) { x == 2 }) + |> expect:equal(_, True) + + list:any([1,2,3,4,5], fn(x) { x < 0 }) + |> expect:equal(_, False) + + list:any([], fn(_) { False }) + |> expect:equal(_, False) +} |