I'm not sure I fully understand your proposal, but when I really need lazy evaluation (which is pretty rare) I reach for `delay` and `force`.
On Tuesday, 26 April 2016 16:41:08 UTC+1, Olek wrote: > > Hi! > > In short: > > I have noticed that in most cases I use macros only for lazy arguments > evaluation. Why not to make something to use only this feature? It would be > light version of macro for clojurescript/clojure and easy to grasp for > newcomers and still powerful in programming (with that you could implement > binding/scopes/interpreter pattern). I love implicite use of macros where > from call point of view the user can't distinguish what is function and > what is macro. > > In long: > > Generally the macros are used in compile phase to manipulate AST (or just > data structures because Clojure is homoiconic) to produce code in order to > be consumed in evaluation phase. > It is nice to include new language constructs with use of macros but as my > experience points out for most time I use macros only for changing > evaluation moment/order. > Maybe there should be some construct like "defnlazy" for which you write > normal function but all input arguments are evaluated only when you > explicitly evaluate them. > What we gain? We don't have to deal with # ` @ list eval and separate > thoughts on read/eval phases, but we still must explicitly say ~ to deref > passed block of construct as argument. > > Also there are some problems to grasp: > - is it safe to implicite convert blocks of construct from statements to > deref objects > - how it should behave when you pass not deref object to another discussed > "defnlazy" > - maybe there shouldn't be any defnlazy but you should just implement it > in arguments destruction so you can use constructs like: > > (defn mycrazyif [ statement ~onsuccess ~onfailure ] > (if statement ; just evalutated with mycrazyif call > @onsucess ; deref block in case of success > @onfailure)) ; deref block in case of failure > > > With regards, > Olek > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
