bottom-up implementation

2 definitions found

bottom-up implementation - Free On-line Dictionary of Computing (26 May 2007) :

  bottom-up implementation
  
     <programming> The opposite of top-down design.  It is now
     received wisdom in most programming cultures that it is best
     to design from higher levels of abstraction down to lower,
     specifying sequences of action in increasing detail until you
     get to actual code.  Hackers often find (especially in
     exploratory designs that cannot be closely specified in
     advance) that it works best to *build* things in the opposite
     order, by writing and testing a clean set of primitive
     operations and then knitting them together.
  
     [Jargon File]
  
     (1996-05-10)
  

bottom-up implementation - Jargon File (4.4.4, 14 Aug 2003) :

  bottom-up implementation
   n.
  
     Hackish opposite of the techspeak term top-down design. It has been
     received wisdom in most programming cultures that it is best to
  design
     from higher levels of abstraction down to lower, specifying sequences
     of action in increasing detail until you get to actual code. Hackers
     often find (especially in exploratory designs that cannot be closely
     specified in advance) that it works best to build things in the
     opposite order, by writing and testing a clean set of primitive
     operations and then knitting them together. Naively applied, this
     leads to hacked-together bottom-up implementations; a more
     sophisticated response is middle-out implementation, in which scratch
     code within primitives at the mid-level of the system is gradually
     replaced with a more polished version of the lowest level at the same
     time the structure above the midlevel is being built.