Join the line above the current line

Question

I often use J to join the current line with the one below:

J                       Join [count] lines, with a minimum of two lines.
                        Remove the indent and insert up to two spaces (see
                        below).  Fails when on the last line of the buffer.
                        If [count] is too big it is reduce to the number of
                        lines available.

Is there a shortcut key for joining the current line with the line above?

Needless to say, kJ does the trick; I just wonder if there's a built-in shortcut for that.

Answer 1

I'm almost sure there is no such mapping. As you wrote, one can use kJ. But if you aren't using K, you can remap it to kJ:

nnoremap K kJ