Hi Giovanni > On 30. Nov 2020, at 13:56, Giovanni Piredda <pired...@posteo.de> wrote: > >> and also it could be mentioned that there are other interesting systems like >> >> https://en.wikipedia.org/wiki/Lout_(software) >> <https://en.wikipedia.org/wiki/Lout_(software)><https://en.wikipedia.org/wiki/Lout_(software) >> <https://en.wikipedia.org/wiki/Lout_(software)>> >> >> which is a lazy functional description language for pages. >> >> > Thanks, I downloaded the system and looked at a few pages of the manual ... > now I need to understand why it is a lazy functional description language, > but that I have to postpone :-) >
evaluation of macro arguments proceed "as needed", for example a macro can produce an infinite list of ".", but the consumer function can decide only to take a finite amount of them (for example to create the .... in a table of contents). In a funcitonal language with strict evaluaiton the infinite list would produce a loop. Similar behaviour in non-lazy languages is obtained via "promises", generators, etc.. Max
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