diff options
Diffstat (limited to 'erts')
| -rw-r--r-- | erts/doc/src/erlang.xml | 20 | ||||
| -rw-r--r-- | erts/preloaded/src/erlang.erl | 6 |
2 files changed, 23 insertions, 3 deletions
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml index 7aaded200c..e7e9b218f2 100644 --- a/erts/doc/src/erlang.xml +++ b/erts/doc/src/erlang.xml @@ -1784,6 +1784,15 @@ os_prompt% </pre> </desc> </func> <func> + <name name="is_map" arity="1"/> + <fsummary>Check whether a term is a map</fsummary> + <desc> + <p>Returns <c>true</c> if <c><anno>Term</anno></c> is a map; + otherwise returns <c>false</c>.</p> + <p>Allowed in guard tests.</p> + </desc> + </func> + <func> <name name="is_number" arity="1"/> <fsummary>Check whether a term is a number</fsummary> <desc> @@ -2220,6 +2229,17 @@ os_prompt% </pre> </desc> </func> <func> + <name name="map_size" arity="1"/> + <fsummary>Return the size of a map</fsummary> + <desc> + <p>Returns an integer which is the number of key-value pairs in <c><anno>Map</anno></c>.</p> + <pre> +> <input>map_size(#{a=>1, b=>2, c=>3}).</input> +3</pre> + <p>Allowed in guard tests.</p> + </desc> + </func> + <func> <name name="max" arity="2"/> <fsummary>Return the largest of two term</fsummary> <desc> diff --git a/erts/preloaded/src/erlang.erl b/erts/preloaded/src/erlang.erl index fbc37bd955..cabbbd191f 100644 --- a/erts/preloaded/src/erlang.erl +++ b/erts/preloaded/src/erlang.erl @@ -1745,9 +1745,9 @@ is_pid(_Term) -> erlang:nif_error(undefined). %% Shadowed by erl_bif_types: erlang:is_map/1 --spec is_map(Map) -> boolean() when - Map :: map(). -is_map(_Map) -> +-spec is_map(Term) -> boolean() when + Term :: term(). +is_map(_Term) -> erlang:nif_error(undefined). %% Shadowed by erl_bif_types: erlang:is_port/1 |