Caveats for Perl programmers

Caveat #1. Numbers and strings are not interchangable! Perl code:

print "2" + "3.1415926";
print 2 . 2;

Corresponding Ruby code:

print "2".to_i + "3.1415926".to_f
print 2.to_s + 2.to_s

Caveat #2. Zero and empty string are true values! Perl code:

print $value if $value;
print $value if defined($value);
sort { uc($a) <=> uc($b) || $a <=> $b } @arr;

Corresponding Ruby code:

print value if value && !value.eql?(0) && !value.eql?("")
print value if value  # or: if defined?(value)
arr.sort { |a,b| (a.upcase <=> b.upcase).nonzero? || a <=> b }

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