Hi,

> On Feb 11, 2015, at 5:42 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.


You’re confusing mutation with single assignment. You’re not mutating anything: 
1 is still 1, 2 is still 2; you’re just assigning the same name to different 
numbers. The numbers themselves are immutable.


hth
lvh

> 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.

Attachment: signature.asc
Description: Message signed with OpenPGP using GPGMail

Reply via email to