- mapping-catenate! mapping1 key value mapping2procedure
The mapping-catenate! procedure is the same as mapping-catenate, except that it is permitted to mutate and return one of the mappings rather than allocating a new mapping.
The mapping-catenate! procedure is the same as mapping-catenate, except that it is permitted to mutate and return one of the mappings rather than allocating a new mapping.