Seqs in Clojure are very much like iterators in other languages. They're an abstraction for navigating a sequential data structure.
Also because values in Clojure are immutable, you rarely, if at all, encounter situations where those objects need to be copied. Why would you, when you can just reference the original object, secure in the knowledge that its value cannot change. - James On 1 December 2013 20:15, Andy Smith <the4thamig...@googlemail.com> wrote: > Can a seq be thought of as a kind of a list of pointers to the original > vector elements then? If so, then does an operation on a vector, (e.g. > reverse), cause clojure to internally generate a seq of pointers to the > original vector elements? In other words seqs seem to provide a layer of > indirection to avoid the need to copy elements of the original collection? > > > On Saturday, 30 November 2013 21:31:34 UTC, Jim foo.bar wrote: > >> On Sat, 30 Nov 2013 13:15:33 -0800 (PST) >> Andy Smith <the4th...@googlemail.com> wrote: >> >> > but >> > my question is really about the more general case of any function >> > that manipulates a vector e.g. the following also returns a list >> > rather than a vector as desired, >> >> In Clojure you rarely have to worry about types. All the >> data-structures fall under a common set of abstractions and in >> particular the ISeq interface. Strictly speaking map returns a seq not >> a list. In fact a lazy seq...this is by design so further operations >> can be applied lazily later...if you use eager operations like mapv >> exclusively you lose the ability to aggregate operations without cost. >> hope that clarifies it... >> >> >> Jim >> > -- > -- > 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/groups/opt_out. > -- -- 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/groups/opt_out.
