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$query == $array->[$center]

$query == $array->[$center] && ($begin
   ? ($center == 0        || $query != $array->[$center-1])
   : ($center == $#$array || $query != $array->[$center+1])
)

sub binarySearch {
  my ($begin, $query, $array) = @_;
...
    $prevCenter = $center;
  }
}