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  1. or download this
    foreach(@a){$_+=1;};

real    0m4.941s
user    0m1.096s
sys    0m3.604s
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    @a = map{$_+= 1} @a;

real    0m6.248s
user    0m2.652s
sys    0m2.900s
  3. or download this
    map{$_+= 1} @a;

real    0m3.224s
user    0m2.908s
sys    0m0.232s