Did a quick benchmark out of curiosity:
KM: substr($_,0,0,"H")
Ovid: s/^(.*)$/H$1/
Shendal: $_ .= "H".$_
turnstep: s/^/H/
Benchmark: timing 100000 iterations of KM, Ovid, Shendal, turnstep...
KM: -1 wallclock secs ( 0.55 usr + 0.00 sys = 0.55 CPU)
Ovid: 2 wallclock secs ( 2.20 usr + 0.00 sys = 2.20 CPU)
Shendal: 0 wallclock secs ( 0.53 usr + 0.00 sys = 0.53 CPU)
turnstep: 1 wallclock secs ( 0.98 usr + 0.00 sys = 0.98 CPU)
Cheers,
KM
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