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What is truth? (Curiosity corner)

by robin (Chaplain)
on Dec 20, 2001 at 22:28 UTC ( #133554=perlmeditation: print w/replies, xml ) Need Help??

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  1. or download this
        sub explain {
            my $val = shift;
            print "Numeric value = ", 0+$val, "\n";
            print "String value = \"$val\"\n";
            print "Truth value = ", $val ? "true\n" : "false\n";
        }
    
  2. or download this
        # explain("23skidoo");
        Numeric value = 23
        String value = "23skidoo"
    ...
        Numeric value = 0
        String value = ""
        Truth value = false
    
  3. or download this
    [robin@robin robin]$ perl -wle 'print 0+"23skidoo"'
    Argument "23skidoo" isn't numeric in addition (+) at -e line 1.
    23
    
  4. or download this
    [robin@robin bits & pieces]$ perl -wle 'print 23+"0 but true"'
    23
    
  5. or download this
        # explain([1,2,3]);
        Numeric value = 25616
        String value = "ARRAY(0x6410)"
        Truth value = true
    
  6. or download this
        my $foo = *bar;
        our $bar = "hello\n";
        our @bar = ("Hello again!\n");
        print $$foo, @$foo;
        explain($foo);
    
  7. or download this
        hello
        Hello again!
        Numeric value = 0
        String value = "*main::bar"
        Truth value = true
    
  8. or download this
        # explain(bless {}, "SomePackage");
        Numeric value = 25616
        String value = "SomePackage=HASH(0x6410)"
        Truth value = true
    
  9. or download this
        explain(bless {}, "SomePackage");
        package SomePackage;
        use overload '""'   => sub {'string value'};
        use overload '0+'   => sub {23};
        use overload 'bool' => sub {""};
        use overload fallback => 1;
    
  10. or download this
        Numeric value = 23
        String value = "string value"
        Truth value = false
    
  11. or download this
        Numeric value = 0
        String value = "string value"
        Truth value = true
    
  12. or download this
        explain(bless {}, "SomePackage");
        package SomePackage;
        use overload '""'   => sub {''};
        use overload '0+'   => sub {23};
        use overload fallback => 1;
    
  13. or download this
        Numeric value = 23
        String value = ""
        Truth value = true
    
  14. or download this
        explain(bless {}, "SomePackage");
        package SomePackage;
        use overload '""'   => sub { '' };
        use overload '0+'   => sub {'00'};
        use overload fallback => 1;
    

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