On Thu, Oct 27, 2011 at 7:42 PM, Stephen C. Gilardi <squee...@mac.com>wrote:
> > On Oct 26, 2011, at 7:08 PM, e wrote: > > > [1 2 3] is a vector that is not evaluated. Since there is no overload > with things that are, there's no need for a special mark. > > If you type [1 2 3] into the REPL it is evaluated. The E part of the REPL > always runs. Some expressions evaluate to themselves. In this case each > number evaluates to itself and the vector evaluates to itself: > > user> [1 2 3] > [1 2 3] > > If you have an expression as one of the items in the vector, it will be > evaluated: > > user> [1 (+ 1 1) 3] > [1 2 3] > > Putting a quote out front suppresses all evaluation: > > user> '[1 (+ 1 1) 3] > [1 (+ 1 1) 3] > > > '(1 2 3) is currently a way of say, "don't evaluate this list", > > More completely it says, "don't evaluate the entire expression that follows > including any and all sub-expressions" > > > but it could have been: > > > > '(1 2 3) is a list that is not evaluated. No loss of generality. it's a > special type of list. One that's not evaluated. as opposed to a special > indicator to the repl. > > Current behavior: > > user> '(1 (+ 1 1) 3) > (1 (+ 1 1) 3) > > The behavior you propose: user> '(1 (+ 1 1) 3) > (1 2 3) > > ^^^^^ excellent explanation right above. +1 > Currently 'x is equivalent to (quote x) for all values of x. With the > syntax you propose that's no longer true. > > clojure.main/repl allows you to replace the evaluator with any function of > one argument. If you bring up a repl with, say, lein repl, you can start a > nested repl with identity as the evaluator and see how things are read > (which can be interesting): > > % lein repl > REPL started; server listening on localhost port 46512 > user=> (clojure.main/repl :eval identity) > user=> (+ 1 2) > (+ 1 2) > user=> '(+ 1 2) > (quote (+ 1 2)) > user=> [1 2 3] > [1 2 3] > user=> [1 (+ 1 1) 3] > [1 (+ 1 1) 3] > user=> 'x > (quote x) > user=> x > x > user=> '[1 (+ 1 1) 3] > (quote [1 (+ 1 1) 3]) > user=> #(+ 3 %) > (fn* [p1__161#] (+ 3 p1__161#)) > > --Steve > > -- > 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
