off top of my head i would probably do something like: 1. (-> some-var (assoc :foo "bar") other-operation and-another)
(see threading macros) 2. (update-in some-map [:entry] #(or % (get-new-value))) in particular, im not sure if there is a more idiomatic way On Mon, Nov 21, 2011 at 12:46 AM, gchristnsn <gchrist...@gmail.com> wrote: > 1. Often I use the following construct: > > (let [some-var (initial-binding) > some-var (some operations (assoc, etc.) using some-var pvevious > binding) > some-var (some operations using some-var pvevious binding > several times)] > (more operations on some-var)) > > This is probably something like the `do' monad, and I like the thing > that the usage of previous binding of the variable is possible freely > anywhere in the context without wrapping operations with fn and > calling threading operator. > But things become bad if misspelling occurs. Are there some library > macros for such operations, or possibility to do this in less error- > prone way? > > 2. Let's assume that there is a map with key :entry, and I need to > assoc new value for this key if it's nil or leave map as is otherwise. > I do this in following way: > > ... > (let [some-map (if (:entry some-map) > some-map > (assoc some-map :entry (get-new-value)))] > ... > > The question is the same: what is the most correct way to do this? > > -- > 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 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