#good
print $array[3]; # faster than...
print $hash{'3'}; #... this

#bad
for(0..$#array){
  if(${$array[$_]}[0] eq 'foobar'){
    print ${$array[$_]}[1];
  } # slower than...
}

print $hash{'foobar'}; #... this

##</code><code>##

map{$a=1-$_/10;map{$d=$a;$e=$b=$_/20-2;map{($d,$e)=(2*$d*$e+$a,$e**2
-$d**2+$b);$c=$d**2+$e**2>4?$d=8:_}1..50;print$c}0..59;print$/}0..20