[erlang-questions] list comprehensions speed
Richard A. O'Keefe
Tue Feb 25 22:22:45 CET 2014
On 26/02/2014, at 5:33 AM, Oleg wrote:
> If we can use =:= for the string matching, why does string module contain equal()?
(2) To have a function that you can pass around.
There's a nasty little gotcha in Erlang, which I've
never been able to see the point of.
In Lisp, I can use #'EQUAL to get the equality function.
" SML, " " " op = " " " " "
" Haskell, " " " (==) " " " " "
In Erlang, there is nothing I can use.
You might expect that fun erlang:'=:='/2 or even
fun =:= would do the trick. But it doesn't. If
you have a function that takes a two-argument "match"
predicate, and you want to pass =:= to it, you must
have a "real" function.
Off-hand, Erlang is the only functional programming
language I can recall using in which the built-in operators
are NOT built-in functions.
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