Dunaj has support for multiple bindings in if-let since version 0.5. http://www.dunaj.org/dunaj.flow.api.html#if_let
Related design page that discusses possible approaches is at https://github.com/dunaj-project/dunaj/wiki/Conditionals Jozef On Tuesday, June 9, 2015 at 4:00:35 PM UTC+2, Lars Andersen wrote: > > I actually wish this was how the if-let macro in core worked. Once in a > blue moon I end up writing nested if-let statements or an if-let with a > nested let. Both of these cases look so ridiculous I often re-write the > the code just avoid it. > > On Tuesday, June 9, 2015 at 2:00:53 PM UTC+2, crocket wrote: >> >> It evaluates true-case only if every local binding evaluates to true values. >> false-case has no access to local bindings. >> >> (defmacro if-let-all >> "if-let-all evaluates every local binding sequentially and evaluates >> true-case only if every local binding is a truthy value. >> true-case has access to all local bindings, but false-case doesn't have >> access to local bindings." >> [bindings true-case false-case] >> (let [pairs (partition 2 bindings) >> names (mapv first pairs) >> exprs (map second pairs) >> exprs-in-if-let (fn self [[name1 & more-names] [expr1 & more-exprs]] >> `(if-let [~name1 ~expr1] >> ~(if more-names >> (self more-names more-exprs) >> names))) >> things (exprs-in-if-let names exprs)] >> `(if-let [~names ~things] >> ~true-case >> ~false-case))) >> >> I think this macro could benefit people if I found the right project where >> it should reside. >> Can anyone help me find the right project for if-let-all? >> >> -- 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.
