Can I pass an argument to a function through a keymapping?

Question

I have a function that takes an argument (num) I'm wanting a mapping so that I can enter a number beforehand and it gets passed to the function.

e.g If I press 3<leader>i

I would like the following to happen: :call MyFunction(3)

Answer 1

The repeat number is automatically stored in v:count and v:count1, whichever suits your needs. Also, you have to drop the line range out (:help c_CTRL-U):

nnoremap <Leader>i :<C-U>call MyFunction(v:count1)<CR>