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Functions in vim

TODO: merge with /vim/scripting/functions.html
Yet to be finished.... 
function Funcname()
  ...
endfunction

Replacing functions

Existing functions can be replaced with a ! following the function keyword: 
function! Funcname()
  ...
endfunction

Function names

Functions must either start with a capital letter. If the function is local to a script, it needs not necessarly start with a capital letter, yet, it must start with a s:

Arguments

Arguments need a a: prefix within the function body, but not within the function declaration. 
function Sum (arg_1, arg_2)
  echo a:arg_1 + a:arg_2
endfunction

Functions operating on a range

If a function is declared with range it will only be executed once when invoked like :'a,'b FirstLastLine() a:firstline and a:lastline will be set accordingly 
function! FirstLastLine() range
  echo a:firstline . " " . a:lastline
endfunction