diff options
Diffstat (limited to 'lib/stdlib/src/lists.erl')
| -rw-r--r-- | lib/stdlib/src/lists.erl | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/lib/stdlib/src/lists.erl b/lib/stdlib/src/lists.erl index f44ed726ca..b82732e0ca 100644 --- a/lib/stdlib/src/lists.erl +++ b/lib/stdlib/src/lists.erl @@ -32,7 +32,7 @@ concat/1, flatten/1, flatten/2, flatlength/1, keydelete/3, keyreplace/4, keytake/3, keystore/4, keysort/2, keymerge/3, rkeymerge/3, rukeymerge/3, - ukeysort/2, ukeymerge/3, keymap/3]). + ukeysort/2, ukeymerge/3, keymap/3, enumerate/1, enumerate/2]). -export([merge/3, rmerge/3, sort/2, umerge/3, rumerge/3, usort/2]). @@ -957,6 +957,24 @@ keymap(Fun, Index, [Tup|Tail]) -> keymap(Fun, Index, []) when is_integer(Index), Index >= 1, is_function(Fun, 1) -> []. +-spec enumerate(List1) -> List2 when + List1 :: [T], + List2 :: [{Index, T}], + Index :: integer(), + T :: term(). +enumerate(List1) -> + enumerate(1, List1). + +-spec enumerate(Index, List1) -> List2 when + List1 :: [T], + List2 :: [{Index, T}], + Index :: integer(), + T :: term(). +enumerate(Index, [H|T]) when is_integer(Index) -> + [{Index, H}|enumerate(Index + 1, T)]; +enumerate(Index, []) when is_integer(Index) -> + []. + %%% Suggestion from OTP-2948: sort and merge with Fun. -spec sort(Fun, List1) -> List2 when |