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| author | Louis Pilfold <louis@lpil.uk> | 2019-05-10 14:15:26 +0100 |
|---|---|---|
| committer | Louis Pilfold <louis@lpil.uk> | 2019-05-10 14:15:26 +0100 |
| commit | dd4c4d9e0e45a487f89cf98bfc24855990e4a8a5 (patch) | |
| tree | 770a2ba4bdf6f6e36fd9bcd8d6d99fa7ac0b5f7e /gen | |
| parent | e1f4d26f3ee2e765c87b02c96950c9e0cb1d8bde (diff) | |
| download | gleam_stdlib-dd4c4d9e0e45a487f89cf98bfc24855990e4a8a5.tar.gz gleam_stdlib-dd4c4d9e0e45a487f89cf98bfc24855990e4a8a5.zip | |
list:range
Diffstat (limited to 'gen')
| -rw-r--r-- | gen/src/list.erl | 14 | ||||
| -rw-r--r-- | gen/test/list_test.erl | 10 |
2 files changed, 22 insertions, 2 deletions
diff --git a/gen/src/list.erl b/gen/src/list.erl index 36fb42d..85df70e 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, index_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, zip/2, intersperse/2, at/2, unique/1, sort/1]). +-export([length/1, reverse/1, is_empty/1, contains/2, head/1, tail/1, filter/2, map/2, index_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, zip/2, intersperse/2, at/2, unique/1, sort/1, range/2]). length(A) -> erlang:length(A). @@ -298,3 +298,15 @@ sort(List) -> BList = drop(List, SplitLength), merge_sort(sort(AList), sort(BList)) end. + +range(Start, Stop) -> + case int:compare(Start, Stop) of + eq -> + []; + + gt -> + [Start | range(Start - 1, Stop)]; + + lt -> + [Start | range(Start + 1, Stop)] + end. diff --git a/gen/test/list_test.erl b/gen/test/list_test.erl index 3011c7e..ca76423 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, any_test/0, zip_test/0, intersperse_test/0, at_test/0, unique_test/0, sort_test/0, index_map_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, zip_test/0, intersperse_test/0, at_test/0, unique_test/0, sort_test/0, index_map_test/0, range_test/0]). length_test() -> expect:equal(list:length([]), 0), @@ -139,3 +139,11 @@ index_map_test() -> F = fun(I, X) -> str:append(X, int:to_string(I)) end, expect:equal(list:index_map([<<"a">>, <<"b">>, <<"c">>], F), [<<"a0">>, <<"b1">>, <<"c2">>]). + +range_test() -> + expect:equal(list:range(0, 0), []), + expect:equal(list:range(1, 1), []), + expect:equal(list:range(-1, -1), []), + expect:equal(list:range(0, 1), [0]), + expect:equal(list:range(0, 5), [0, 1, 2, 3, 4]), + expect:equal(list:range(1, -5), [1, 0, -1, -2, -3, -4]). |