Vim: built in functions

Some interesting built in function of VIM include, IMHO:

• call
• char2nr
• echo
• executable
• exists
• expand
• extend
• feedkeys
• fnamemodify
• function
• get
• has
• has_key
• join
• keys
• map
• maparg
• match
• matchlist
• nr2char to convert ASCII values in their corresponding character.
• range
• random: Apparently, there is no built-in function that produces a random number.
• readfile and writefile
• searchpos
• setreg
• sort
• split
• strchars
• strdisplaywidth
• strftime
• strlen
• strpart
• strwidth
• str2nr converts a string with a number in a binary, octal, decimal or hexadecimal representation to a numeric.
• submatch
• substitute
• system
• type