Thank you all! I knew there was something simple that i was missing!
On Apr 22, 7:28 am, Douglas Philips <d...@mac.com> wrote: > On 2010 Apr 22, at 8:17 AM, Base wrote: > > > say i have a string that contains a form: > > > "(+ 1 1)" > > > I want to actually execute this. How do you do this? I thought that > > eval would be able to handle this but apparently am misunderstanding > > what eval does. > > Well, eval is the second half of what you want. > eval evaluates a form. > user=> (read-string "(+ 1 1)") > (+ 1 1) > user=> (eval (read-string "(+ 1 1)")) > 2 > > eval can be a dangerous thing to use, you have to be very careful > about where the source has come from, in terms of trusting that the > code your programs 'eval's will not be malicious or dangerous in some > way. There are no absolute rules for this, it depends on your > application. > > read can also be a dangerous thing to use, as per the doc on *read- > eval* quoted here: > clojure.core/*read-eval* > nil > When set to logical false, the EvalReader (#=(...)) is disabled in > the > read/load in the thread-local binding. > Example: (binding [*read-eval* false] (read-string "#=(eval (def x > 3))")) > > Defaults to true > > (Note to doc folks, #= does not seem to be described > on:http://clojure.org/reader > with the other # reader macros.) > > -Doug > > -- > 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 > athttp://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
