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-rw-r--r--erts/doc/src/erlang.xml20
1 files changed, 19 insertions, 1 deletions
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml
index d4d4dd7f31..f561413fab 100644
--- a/erts/doc/src/erlang.xml
+++ b/erts/doc/src/erlang.xml
@@ -2965,6 +2965,25 @@ 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>
@@ -10999,4 +11018,3 @@ true</pre>
</func>
</funcs>
</erlref>
-