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| author | Hans Bolinder <[email protected]> | 2018-02-27 15:42:52 +0100 |
|---|---|---|
| committer | Hans Bolinder <[email protected]> | 2018-03-09 14:45:42 +0100 |
| commit | 5c7209c2874849a5a7339e23fdbd9aed1bb935b2 (patch) | |
| tree | 66d3f1b29fb11f9db988b514800be926737a5641 /lib/stdlib/src | |
| parent | 13e83e2e11b3d211c17c53140249a235b4d7a436 (diff) | |
| download | otp-5c7209c2874849a5a7339e23fdbd9aed1bb935b2.tar.gz otp-5c7209c2874849a5a7339e23fdbd9aed1bb935b2.tar.bz2 otp-5c7209c2874849a5a7339e23fdbd9aed1bb935b2.zip | |
stdlib: Add function lists:search/2
This is essentially PR 102, https://github.com/erlang/otp/pull/102.
The OTP Technical Board decided to change the name of the function to
search/2.
Diffstat (limited to 'lib/stdlib/src')
| -rw-r--r-- | lib/stdlib/src/lists.erl | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/lib/stdlib/src/lists.erl b/lib/stdlib/src/lists.erl index af9d63ddd6..06c90c0280 100644 --- a/lib/stdlib/src/lists.erl +++ b/lib/stdlib/src/lists.erl @@ -1,7 +1,7 @@ %% %% %CopyrightBegin% %% -%% Copyright Ericsson AB 1996-2016. All Rights Reserved. +%% Copyright Ericsson AB 1996-2018. All Rights Reserved. %% %% Licensed under the Apache License, Version 2.0 (the "License"); %% you may not use this file except in compliance with the License. @@ -38,8 +38,8 @@ -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, + mapfoldl/3,mapfoldr/3,foreach/2,takewhile/2,dropwhile/2, + search/2, splitwith/2,split/2, join/2]). %%% BIFs @@ -1399,6 +1399,19 @@ dropwhile(Pred, [Hd|Tail]=Rest) -> end; dropwhile(Pred, []) when is_function(Pred, 1) -> []. +-spec search(Pred, List) -> {value, Value} | false when + Pred :: fun((T) -> boolean()), + List :: [T], + Value :: T. + +search(Pred, [Hd|Tail]) -> + case Pred(Hd) of + true -> {value, Hd}; + false -> search(Pred, Tail) + end; +search(Pred, []) when is_function(Pred, 1) -> + false. + -spec splitwith(Pred, List) -> {List1, List2} when Pred :: fun((T) -> boolean()), List :: [T], |