Local bindings are immutable. Your example demonstrates lexical shadowing of bindings.
This is an equivalent program semantically. (let [x 1 x_1 (inc x) x_2 (inc x_1) x_3 (inc x_2)] x_3) By the rules of lexical scoping, you cannot access the first `x` but it is never mutated. Thanks, Ambrose On Wed, Feb 11, 2015 at 8:42 PM, gvim <gvi...@gmail.com> wrote: > Why is this possible in a language based on immutability: > > (let [x 1 > x (inc x) > x (inc x) > x (inc x)] > x) > > ;;=> 4 > > Maybe under the hood (ie. memory registers/pointers etc.) this isn't > strictly mutation but as a relative newcomer to Clojure I find it goes > against the grain of what I find elsewhere in the language. > > gvim > > > -- > 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. > -- 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.