On Mon, Sep 02, 2019 at 11:44:10AM +0200, Andreas Röhler wrote:
> Hi,
> 
> is there a recommended way to replace element x at index i of
> somelist  y by newelement?

Like this?

  scheme@(guile-user)> (define lst (list-copy '(fire water air earth)))
  scheme@(guile-user)> (list-set! lst 2 'mud)
  $3 = mud
  scheme@(guile-user)> lst
  $4 = (fire water mud earth)
  
Note the "list-copy" above. Strange things might happen to your computer
if you try to mutate immutable data ;-D

Cheers
-- t