From: arne@vajhoej.dk   
      
   On 11/19/2025 1:19 PM, Dan Cross wrote:   
   > In article <10fkvfr$2d2kr$1@dont-email.me>,   
   > Arne Vajhøj   wrote:   
   >> On 11/19/2025 11:12 AM, Dan Cross wrote:   
   >>> In article <10fig54$1n41a$3@dont-email.me>,   
   >>> Arne Vajhøj   wrote:   
   >>>> Option is in fashion in recent years.   
   >>>   
   >>> Algebraic data types have been used in functional languages   
   >>> since the 1970s, starting with the "Hope" language from   
   >>> Edinburgh.  ML took them from Hope and popularized them, and   
   >>> they leaked into Miranda, Haskell, and OCaml from there.  Now   
   >>> many languages support them; even C++ (`std::optional`).   
   >>>   
   >>> Hope was first described in a paper in 1980, but the work of   
   >>> course predated that.   
   >>>   
   >>> That makes them about as old as VMS, and older than Ada.  In   
   >>> other words, they've been "In Fashion" since the 70s, which as   
   >>> far as all things fashion goes, is a pretty good run;   
   >>> particularly considering some of the things that were popular in   
   >>> that decade.   
   >>   
   >> I would not consider Haskell, OCaml to ever have been in fashion.   
   >   
   > In your world of business software programming?  That's probably   
   > true.  In the world of research and systems?  Definitely not   
   > true.   
      
   Hmm.   
      
   I would say that the main area for Haskell and OCampl outside of   
   university CS departments is in finance, which is business software.   
      
   Just still just a niche in those companies overall IT landscape.   
      
   Arne   
      
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