On May 29, 2014, at 7:11 PM, ian.tegebo <[email protected]> wrote:

> user> (binding [*ns* (the-ns 'blah)] (defn foo []))
> #'user/foo
> user> (binding [*ns* (the-ns 'blah)] (eval '(defn foo [])))
> #'blah/foo

clojure.core/eval evaluates a form by compiling it and then executing the 
compiled code. For a def form, it's the ns that is current when the form is 
compiled that determines in which namespace the resulting var is created.

In the first case, the defn form is compiled before the binding to (the-ns 
'blah) is in effect.

In the second case, the defn form is quoted and remains unevaluated while the 
binding form is compiled. While executing the compiled code for the binding 
form, eval compiles the defn form (and then executes its compiled code). In 
this case, the defn is compiled after the binding to (the-ns 'blah) is in 
effect.

--Steve

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