[Chicago-talk] Removing "." from a string?

[Steven Lembark]

Eric Ellington wrote:
>>    subst:  0 wallclock secs ( 0.91 usr +  0.00 sys =  0.91 CPU) @
>> 10989010.99/s (n=10000000)
>>
>>       tr:  1 wallclock secs ( 1.51 usr +  0.00 sys =  1.51 CPU) @
>> 6622516.56/s (n=10000000)
>>
>>   'subst' => "\$dotted_quad    =~ s/\D//g;",
>>
>
> I am confused. Didn't Andy Bach show that s/// was the quickest in this case?
> In what case would tr be quicker?

No index + substr is. Index is a single C call
and substr does a single memcpy within the
malloc'd block and reduces the string length.

-- 
Steven Lembark                                          +1 888 359 3508
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