From: janburse@fastmail.fm   
      
   Hi,   
      
   We recently made public a new version of Dogelog   
   Player that features arrow functions via the syntax   
   operator (=>)/2. An interesting mark of the current   
   release is that the arrow functions are automatically   
   compiled and decompiled inside static clauses.   
      
   Although our main use case was higher order logic   
   programming, an alternative use case is object   
   oriented logic programming. In particular we make a   
   short dive into the variant of so called prototype   
   based programming, also sometimes termed the   
   classless approach.   
      
   We use arrow functions (=>)/2 with a Pythonesk   
   self parameter, to give dicts properties that will   
   behave like methods. Creating copies, as sometimes   
   suggested by Logtalk, might work well for value   
   object. But to update an arrow function inside a   
   prototype, we used a non-backtracking mutator.   
      
   Bye   
      
   See also:   
      
   Prototype-Based Programming in Dogelog Player   
   https://qiita.com/j4n_bur53/items/3a68d42af9b86fce8bdf   
      
   Mild Shock schrieb:   
   > Dear All,   
   >   
   > We are happy to announce a new edition of   
   > the Dogelog Player:   
   >   
   > - Arrow Functions:   
   > Using superintelligence in the loop, our development   
   > cycle has reached new hights of innovation and   
   > unprecedent delivery speed. Dogelog Player now has   
   > arrow functions using a (=>)/2 operator. The semantics   
   > is different from other offerings and based on ISO   
   > core standard witness calculation [7.1.1.4].   
   >   
   > - Arrow Compilation:   
   > But we did not stop at interpreted arrow functions,   
   > the Prolog system also offers ahead of time   
   > compilation, which covers both library(yall) and   
   > library(apply_macros) from SWI-Prolog. But it goes   
   > beyond, there is no need for meta predicate   
   > declarations, and compiled arrow functions can   
   > be stored inside Prolog facts.   
   >   
   > - Arrow Decompilation:   
   > The compilation compensates the additional effort   
   > of witness calculuation and we get same execution   
   > speed as SWI-Prolog. The code result is similarly   
   > cryptic. The good news is, the compilation can be   
   > easily undone. This is realized in Dogelog Player   
   > so that clause listing and the interactive debugger   
   > show the original arrow functions.   
   >   
   > Have Fun!   
   >   
   > Jan Burse, https://www.herbrand.ai/ , 27.10.2025   
      
   --- SoupGate-Win32 v1.05   
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