[erlang-questions] String continuation

Raimo Niskanen <>
Fri Jan 14 09:37:25 CET 2011


On Thu, Jan 13, 2011 at 09:16:23PM +0000, Robert Virding wrote:
> ----- "Ulf Wiger" <> wrote:
> 
> > On 13 Jan 2011, at 19:07, Evgeniy Khramtsov wrote:
> > 
> > > ++ operator is slow. It is better to use dialyzer in order to track
> > such errors.
> > 
> > 
> > Efficiency Guide, Chapter 2.4 - Myth: '++' is always bad
> > http://erlang.org/doc/efficiency_guide/myths.html#id54761
> 
> It gets even better. The compiler will at compile time optimise "string3" ++ "string4" to "string3string4". So:
> 
> "string3" "string4" --> "string3string4" during parsing
> "string3" ++ "string4" --> "string3string4" during compiling

And, "string3"++A is optimised into [$s,$t,$r,$i,$n,$g,$3|A].

> 
> There is no escape.
> 
> Robert
> 
> -- 
> Robert Virding, Erlang Solutions Ltd.
> 
> 
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-- 

/ Raimo Niskanen, Erlang/OTP, Ericsson AB


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