From: Ara.T.Howard@...
Date: 2005-06-03T05:20:24+09:00
Subject: Re: Interesting discovery...

On Fri, 3 Jun 2005, Joel VanderWerf wrote:

> Ara.T.Howard@noaa.gov wrote:
>
>>   Benchmark::bm do |b|
>>     %w(rescue_test respond_to_test).map{|m| b.report(m){c.send m,n}}
>>   end
>>
>>
>>   harp:~ > ruby a.rb
>>         user     system      total        real
>>   rescue_test  2.940000   0.320000   3.260000 (  3.264758)
>>   respond_to_test  0.160000   0.050000   0.210000 (  0.208268)
>>
>>
>> looks like respond_to? is indeed faster.
>
> But if the method *is* defined, rescue is faster:
>
>   class C
>     def a; end   # <== added
>     def c; end
>   ...
>
>
>                           user     system      total        real
> rescue_test           0.070000   0.000000   0.070000 (  0.072631)
> respond_to_test       0.130000   0.010000   0.140000 (  0.140980)
>
>
> So, if some obejcts have the methods and some dont, the best choice
> depends on the balance between the two branches (defined vs. undefined).

very true - i hadn't thought of that...

thanks.

-a
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