diff options
Diffstat (limited to 'src/gleam_stdlib.erl')
| -rw-r--r-- | src/gleam_stdlib.erl | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/src/gleam_stdlib.erl b/src/gleam_stdlib.erl index 49a7e2a..fbd84da 100644 --- a/src/gleam_stdlib.erl +++ b/src/gleam_stdlib.erl @@ -7,7 +7,7 @@ iodata_append/2, iodata_prepend/2, identity/1, decode_int/1, decode_string/1, decode_bool/1, decode_float/1, decode_thunk/1, decode_atom/1, decode_list/1, decode_field/2, decode_element/2, parse_int/1, parse_float/1, compare_strings/2, - string_contains/2]). + string_contains/2, string_starts_with/2, string_ends_with/2]). should_equal(Actual, Expected) -> ?assertEqual(Expected, Actual). should_not_equal(Actual, Expected) -> ?assertNotEqual(Expected, Actual). @@ -127,3 +127,15 @@ string_contains(Haystack, Needle) -> _ -> true end. + +string_starts_with(_, <<>>) -> true; +string_starts_with(String, Prefix) when byte_size(Prefix) > byte_size(String) -> false; +string_starts_with(String, Prefix) -> + PrefixSize = byte_size(Prefix), + Prefix == binary_part(String, 0, PrefixSize). + +string_ends_with(_, <<>>) -> true; +string_ends_with(String, Suffix) when byte_size(Suffix) > byte_size(String) -> false; +string_ends_with(String, Suffix) -> + SuffixSize = byte_size(Suffix), + Suffix == binary_part(String, byte_size(String) - SuffixSize, SuffixSize). |