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| author | Björn Gustavsson <[email protected]> | 2016-04-29 09:54:12 +0200 |
|---|---|---|
| committer | Björn Gustavsson <[email protected]> | 2016-04-29 09:54:12 +0200 |
| commit | 06fe4914224a7172a60d318e15885841981b746d (patch) | |
| tree | 030df2277391ee052f77df65fb6da1c133d39f3d /lib/stdlib/src | |
| parent | e142c20d5d751c0b9ba8c059249097b459ac329e (diff) | |
| parent | c660e30a7dd781f71bed050b20c3e2d0b069e063 (diff) | |
| download | otp-06fe4914224a7172a60d318e15885841981b746d.tar.gz otp-06fe4914224a7172a60d318e15885841981b746d.tar.bz2 otp-06fe4914224a7172a60d318e15885841981b746d.zip | |
Merge branch 'jlouis/stdlib/implement-lists-join/PR-1012/OTP-13523'
* jlouis/stdlib/implement-lists-join/PR-1012/OTP-13523:
Implement lists:join/2
Diffstat (limited to 'lib/stdlib/src')
| -rw-r--r-- | lib/stdlib/src/lists.erl | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/lib/stdlib/src/lists.erl b/lib/stdlib/src/lists.erl index 2b4472cdf7..af9d63ddd6 100644 --- a/lib/stdlib/src/lists.erl +++ b/lib/stdlib/src/lists.erl @@ -39,7 +39,8 @@ -export([all/2,any/2,map/2,flatmap/2,foldl/3,foldr/3,filter/2, partition/2,zf/2,filtermap/2, mapfoldl/3,mapfoldr/3,foreach/2,takewhile/2,dropwhile/2,splitwith/2, - split/2]). + split/2, + join/2]). %%% BIFs -export([keyfind/3, keymember/3, keysearch/3, member/2, reverse/2]). @@ -1439,6 +1440,18 @@ split(N, [H|T], R) -> split(_, [], _) -> badarg. +-spec join(Sep, List1) -> List2 when + Sep :: T, + List1 :: [T], + List2 :: [T], + T :: term(). + +join(_Sep, []) -> []; +join(Sep, [H|T]) -> [H|join_prepend(Sep, T)]. + +join_prepend(_Sep, []) -> []; +join_prepend(Sep, [H|T]) -> [Sep,H|join_prepend(Sep,T)]. + %%% ================================================================= %%% Here follows the implementation of the sort functions. %%% |