Check if there is a mapping that matches with {name} in mode {mode}. See |maparg()| for {mode} and special names in {name}. When {abbr} is there and it is |TRUE| use abbreviations instead of mappings. A match happens with a mapping that starts with {name} and with a mapping which is equal to the start of {name}. matches mapping "a" "ab" "abc" ~ mapcheck("a") yes yes yes mapcheck("abc") yes yes yes mapcheck("ax") yes no no mapcheck("b") no no no The difference with maparg() is that mapcheck() finds a mapping that matches with {name}, while maparg() only finds a mapping for {name} exactly. When there is no mapping that starts with {name}, an empty String is returned. If there is one, the RHS of that mapping is returned. If there are several mappings that start with {name}, the RHS of one of them is returned. This will be "" if the RHS is empty. The mappings local to the current buffer are checked first, then the global mappings. This function can be used to check if a mapping can be added without being ambiguous. Example: :if mapcheck("_vv") == "" : map _vv :set guifont=7x13<CR :endif This avoids adding the "_vv" mapping when there already is a mapping for "_v" or for "_vvv". Can also be used as a |method|: GetKey()->mapcheck('n')