How about this:
(#(true)), is this not calling a function that has no arguments and
returns true? But it still gives same exception
This actually is trying to call 'true' as if it were a function, not a
constant. The thing I think you're missing here is: when a symbol is
butted up against an
As you've already seen, if you just want the original value returned
from a function, you can call the 'identity' function with that
something as an argument, as in #(identity %) or #(identity true),
etc.
I should have also made clear here that you would never actually use
this in real code,
2011/9/4 julianrz julia...@yahoo.com
Hello All,
I am new to Clojure. Surprised why this code does not work:
user= (filter #(%) [1 2 3])
ClassCastException java.lang.Long cannot be cast to clojure.lang.IFn
Here my intent behind #(%) is to define a lambda function returning
its argument.
As Laurent says, you should just use the built-in `identity` function,
but you can write it yourself: as you noticed, (fn [x] x) works, but
if you want to do it with the shorthand syntax you can use #(do %).
On Sep 4, 1:56 pm, julianrz julia...@yahoo.com wrote:
Hello All,
I am new to Clojure.
(NO_SOURCE_FILE:0)
I come from Scala experience, where it is easy to define a quick
lambda function returning a constant or another simple expression,
e.g. = true is a function with no args and returning true. Things
like that are sometimes useful to pass into higher-order functions
expecting a function
(#(true)), is this not calling a function that has no arguments and
returns true? But it still gives same exception
Not really:
user= (macroexpand-1 '#(true))
(fn* [] (true))
I guess I should forgo the macro
and go directly with (fn [] true)
For something like = true try:
user= (defmacro =
On Sep 6, 2011, at 10:43 PM, Armando Blancas wrote:
For something like = true try:
user= (defmacro = [expr] `(fn [] ~expr))
#'user/= (macroexpand-1 '(= true))
(clojure.core/fn [] true)
Alternatively: (constantly true)
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On Tue, Sep 6, 2011 at 7:32 PM, julianrz julia...@yahoo.com wrote:
I come from Scala experience, where it is easy to define a quick
lambda function returning a constant or another simple expression,
e.g. = true is a function with no args and returning true. Things
like that are sometimes
