diff options
Diffstat (limited to 'erts/doc/src/erlang.xml')
| -rw-r--r-- | erts/doc/src/erlang.xml | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml index c086928bb3..e287db88d3 100644 --- a/erts/doc/src/erlang.xml +++ b/erts/doc/src/erlang.xml @@ -2969,6 +2969,25 @@ os_prompt%</pre> </func> <func> + <name name="map_get" arity="2" /> + <fsummary>Extract a value from a map</fsummary> + <desc> + <p>Returns value <c><anno>Value</anno></c> associated with + <c><anno>Key</anno></c> if <c><anno>Map</anno></c> contains + <c><anno>Key</anno></c>.</p> + <p>The call fails with a <c>{badmap,Map}</c> exception if + <c><anno>Map</anno></c> is not a map, or with a <c>{badkey,Key}</c> + exception if no value is associated with <c><anno>Key</anno></c>.</p> + <p><em>Example:</em></p> + <code type="none"> +> Key = 1337, + Map = #{42 => value_two,1337 => "value one","a" => 1}, + map_get(Key,Map). +"value one"</code> + </desc> + </func> + + <func> <name name="map_size" arity="1"/> <fsummary>Return the size of a map.</fsummary> <desc> @@ -11003,4 +11022,3 @@ true</pre> </func> </funcs> </erlref> - |