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-rw-r--r--lib/stdlib/doc/src/maps.xml36
1 files changed, 36 insertions, 0 deletions
diff --git a/lib/stdlib/doc/src/maps.xml b/lib/stdlib/doc/src/maps.xml
index 97a7438890..bf45461e2b 100644
--- a/lib/stdlib/doc/src/maps.xml
+++ b/lib/stdlib/doc/src/maps.xml
@@ -381,6 +381,42 @@ error</code>
</desc>
</func>
+ <func>
+ <name name="update_with" arity="3"/>
+ <fsummary></fsummary>
+ <desc>
+ <p>Update a value in a <c><anno>Map1</anno></c> associated with <c><anno>Key</anno></c> by
+ calling <c><anno>Fun</anno></c> on the old value to get a new value. An exception
+ <c>{badkey,<anno>Key</anno>}</c> is generated if
+ <c><anno>Key</anno></c> is not present in the map.</p>
+ <p>Example:</p>
+ <code type="none">
+> Map = #{"counter" => 1},
+ Fun = fun(V) -> V + 1 end,
+ maps:update_with("counter",Fun,Map).
+#{"counter" => 2}</code>
+ </desc>
+ </func>
+
+ <func>
+ <name name="update_with" arity="4"/>
+ <fsummary></fsummary>
+ <desc>
+ <p>Update a value in a <c><anno>Map1</anno></c> associated with <c><anno>Key</anno></c> by
+ calling <c><anno>Fun</anno></c> on the old value to get a new value.
+ If <c><anno>Key</anno></c> is not present
+ in <c><anno>Map1</anno></c> then <c><anno>Init</anno></c> will be associated with
+ <c><anno>Key</anno></c>.
+ </p>
+ <p>Example:</p>
+ <code type="none">
+> Map = #{"counter" => 1},
+ Fun = fun(V) -> V + 1 end,
+ maps:update_with("new counter",Fun,42,Map).
+#{"counter" => 1,"new counter" => 42}</code>
+ </desc>
+ </func>
+
<func>
<name name="values" arity="1"/>
<fsummary></fsummary>