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| author | Björn-Egil Dahlberg <[email protected]> | 2014-05-26 16:38:50 +0200 |
|---|---|---|
| committer | Björn-Egil Dahlberg <[email protected]> | 2014-05-26 16:38:50 +0200 |
| commit | 6b6cd01b607a1bfcf61bb6d5f4cc3fe9b37445db (patch) | |
| tree | 3e6200ef0f4c9563957daac8f14298faeb314094 /lib/stdlib/src | |
| parent | 6731d295915448e4c219f1db1b146264ced68018 (diff) | |
| parent | 47463022cea3b7ca89124c1607cf10b92fbb536f (diff) | |
| download | otp-6b6cd01b607a1bfcf61bb6d5f4cc3fe9b37445db.tar.gz otp-6b6cd01b607a1bfcf61bb6d5f4cc3fe9b37445db.tar.bz2 otp-6b6cd01b607a1bfcf61bb6d5f4cc3fe9b37445db.zip | |
Merge branch 'saa/add_default_value_for_maps_get/OTP-11951' into maint
* saa/add_default_value_for_maps_get/OTP-11951:
stdlib: Fix indentation of maps doc
Add docs and test for maps:get/3
Add default value for maps:get
Diffstat (limited to 'lib/stdlib/src')
| -rw-r--r-- | lib/stdlib/src/maps.erl | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/lib/stdlib/src/maps.erl b/lib/stdlib/src/maps.erl index fd6d56fa47..4ef1638e6d 100644 --- a/lib/stdlib/src/maps.erl +++ b/lib/stdlib/src/maps.erl @@ -23,7 +23,8 @@ fold/3, map/2, size/1, - without/2 + without/2, + get/3 ]). @@ -142,6 +143,21 @@ values(_) -> erlang:nif_error(undef). %%% End of BIFs +-spec get(Key, Map, Default) -> Value | Default when + Key :: term(), + Map :: map(), + Value :: term(), + Default :: term(). + +get(Key, Map, Default) -> + case maps:find(Key, Map) of + {ok, Value} -> + Value; + error -> + Default + end. + + -spec fold(Fun,Init,Map) -> Acc when Fun :: fun((K, V, AccIn) -> AccOut), Init :: term(), |