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#!/usr/bin/perl -w
use strict;
...

timethese(100_000, {join => \&joinit,
                    slash => \&dollarslash} );

Benchmark: timing 100000 iterations of join, slash...
      join: 12 wallclock secs ( 9.98 usr +  1.33 sys = 11.31 CPU)
     slash:  6 wallclock secs ( 3.79 usr +  1.53 sys =  5.32 CPU)