Provided by: libautobox-core-perl_1.32-1_all bug

NAME

       autobox::Core - Provide core functions to autoboxed scalars, arrays and hashes.

SYNOPSIS

         use autobox::Core;

         "Hello, World\n"->uc->print;

         my @list = (1, 5, 9, 2, 0, 4, 2, 1);
         @list->sort->reverse->print;

         # works with references too!
         my $list = [1, 5, 9, 2, 0, 4, 2, 1];
         $list->sort->reverse->print;

         my %hash = (
             grass => 'green',
             apple => 'red',
             sky   => 'blue',
         );

         [10, 20, 30, 40, 50]->pop->say;
         [10, 20, 30, 40, 50]->shift->say;

         my $lala = "Lalalalala\n";
         "chomp: "->concat($lala->chomp, " ", $lala)->say;

         my $hashref = { foo => 10, bar => 20, baz => 30, qux => 40 };

         print "hash keys: ", $hashref->keys->join(' '), "\n"; # or if you prefer...
         print "hash keys: ", join ' ', $hashref->keys(), "\n"; # or
         print "hash keys: "; $hashref->keys->say;

DESCRIPTION

       The autobox module promotes Perl's primitive types (literals (strings and numbers),
       scalars, arrays and hashes) into first-class objects.  However, autobox does not provide
       any methods for these new classes.

       autobox::CORE provides a set of methods for these new classes.  It includes almost
       everything in perlfunc, some things from Scalar::Util and List::Util, and some Perl 5
       versions of methods taken from Perl 6.

       With autobox::Core one is able to change this:

               print join(" ", reverse(split(" ", $string)));

       to this:

               use autobox::Core;

               $string->split(" ")->reverse->print;

       Likewise you can change this:

               my $array_ref = [qw(fish dog cat elephant bird)];

               push @$array_ref, qw(snake lizard giraffe mouse);

       to this:

               use autobox::Core;
               my $array_ref = [qw(fish dog cat elephant bird)];

               $array_ref->push( qw(snake lizard giraffe mouse));

       autobox::Core makes it easier to avoid parentheses pile ups and messy dereferencing
       syntaxes.

       autobox::Core is mostly glue.  It presents existing functions with a new interface, while
       adding few extra. Most of the methods read like "sub hex { CORE::hex($_[0]) }".  In
       addition to built-ins from perlfunc that operate on hashes, arrays, scalars, and code
       references, some Perl 6-ish things have been included, and some keywords like "foreach"
       are represented too.

   What's Implemented?
       •   Many of the functions listed in perlfunc under the headings:

           •   "Functions for real @ARRAYs",

           •   "Functions for real %HASHes",

           •   "Functions for list data",

           •   "Functions for SCALARs or strings"

           plus a few taken from other sections and documented below.

       •   Some methods from Scalar::Util and List::Util.

       •   Some things expected in Perl 6, such as "last" ("last_idx"), "elems", and "curry".

       •   "flatten" explicitly flattens an array.

       String Methods

       String methods are of the form "my $return = $string->method(@args)".  Some will act on
       the $string and some will return a new string.

       Many string methods are simply wrappers around core functions, but there are additional
       operations and modifications to core behavior.

       Anything which takes a regular expression, such as split and m, usually take it in the
       form of a compiled regex ("qr//").  Any modifiers can be attached to the "qr" normally.
       Bare strings may be used in place of regular expressions, and Perl will compile it to a
       regex, as usual.

       These built in functions are implemented for scalars, they work just like normal: chomp,
       chop,chr crypt, index, lc lcfirst, length, ord, pack, reverse (always in scalar context),
       rindex, sprintf, substr, uc ucfirst, unpack, quotemeta, vec, undef, split, system, eval.

       In addition, so are each of the following:

       concat

          $string1->concat($string2);

       Concatenates $string2 to $string1. This corresponds to the "." operator used to join two
       strings.  Returns the joined strings.

       strip

       Removes whitespace from the beginning and end of a string.

          " \t  \n  \t  foo  \t  \n  \t  "->strip;    # foo

       This is redundant and subtly different from "trim" which allows for the removal of
       specific characters from the beginning and end of a string.

       trim

       Removes whitespace from the beginning and end of a string.  "trim" can also remove
       specific characters from the beginning and the end of string.

          '    hello'->trim;                   # 'hello'
          '*+* hello *+*'->trim("*+");         # ' hello '
          ' *+* hello *+*'->trim("*+");        # ' *+* hello'

       ltrim

       Just like trim but it only trims the left side (start) of the string.

          '    hello'->ltrim;                  # 'hello'
          '*+* hello *+*'->ltrim("*+");        # ' hello *+*'

       rtrim

       Just like trim but it only trims the right side (end) of the string.

          'hello   '->rtrim;                   # 'hello'
          '*+* hello *+*'->rtrim("*+");        # '*+* hello '

       split

           my @split_string = $string->split(qr/.../);
           my @split_string = $string->split(' ');

       A wrapper around split. It takes the regular expression as a compiled regex, or a string
       which Perl parses as a regex.

          print "10, 20, 30, 40"->split(qr{, ?})->elements, "\n";
          "hi there"->split(qr/ */);           # h i t h e r e

       The limit argument is not implemented.

       title_case

       "title_case" converts the first character of each word in the string to upper case.

          "this is a test"->title_case;        # This Is A Test

       center

           my $centered_string = $string->center($length);
           my $centered_string = $string->center($length, $character);

       Centers $string between $character.  $centered_string will be of length $length, or the
       length of $string, whichever is greater.

       $character defaults to " ".

           say "Hello"->center(10);        # "   Hello  ";
           say "Hello"->center(10, '-');   # "---Hello--";

       "center()" will never truncate $string.  If $length is less than "$string->length" it will
       just return $string.

           say "Hello"->center(4);        # "Hello";

       qx

           my $output = $string->qx;

       Runs $string as a command just enclosing it backticks, as in "`$string`".

       nm

           if( $foo->nm(qr/bar/) ) {
               say "$foo did not match 'bar'";
           }

       "Negative match".  Corresponds to "!~".  Otherwise works in the same way as "m()".

       m

           if( $foo->m(qr/bar/) ) {
               say "$foo matched 'bar'";
           }

           my $matches = $foo->m( qr/(\d*) (\w+)/ );
           say $matches->[0];
           say $matches->[1];

       Works the same as "m//", but the regex must be passed in as a "qr//".

       "m" returns an array reference so that list functions such as "map" and "grep" may be
       called on the result.  Use "elements" to turn this into a list of values.

         my ($street_number, $street_name, $apartment_number) =
             "1234 Robin Drive #101"->m( qr{(\d+) (.*)(?: #(\d+))?} )->elements;

         print "$street_number $street_name $apartment_number\n";

       s

         my $string = "the cat sat on the mat";
         $string->s( qr/cat/, "dog" );
         $string->say;                 # the dog sat on the mat

       String substitution.  Works similarly to "s///".  In boolean context, it returns
       true/false to indicate whether the substitution succeeded.  "if", "?:", "!", and so on,
       all provide boolean context.  It either fails or succeeds, having replaced only one
       occurrence on success -- it doesn't replace globally.  In scalar context other than
       boolean context, it returns the modified string (incompatible change, new as of v 1.31).

       undef

           $string->undef;

       Assigns "undef" to the $string.

       defined

           my $is_defined = $string->defined;

           if( not $string->defined ) {
               # give $string a value...
           }

       "defined" tests whether a value is defined (not "undef").

       repeat

           my $repeated_string = $string->repeat($n);

       Like the "x" operator, repeats a string $n times.

           print 1->repeat(5);     # 11111
           print "\n"->repeat(10); # ten newlines

       I/O Methods

       These are methods having to do with input and ouptut, not filehandles.

       print

           $string->print;

       Prints a string or a list of strings.  Returns true if successful.

       say

       Like print, but implicitly appends a newline to the end.

            $string->say;

       Boolean Methods

       Methods related to boolean operations.

       and

       "and" corresponds to "&&".  Returns true if both operands are true.

               if( $a->and($b) ) {
                   ...
               }

       not

       "not" corresponds to "!".  Returns true if the subject is false.

               if( $a->not ) {
                   ...
               }

       or

       "or" corresponds to "||".  Returns true if at least one of the operands is true.

               if( $a->or($b) ) {
                   ...
               }

       xor

       "xor" corresponds to "xor".  Returns true if only one of the operands is true.

               if( $a->xor($b) ) {
                   ...
               }

       Number Related Methods

       Methods related to numbers.

       The basic built in functions which operate as normal : abs, atan2, cos, exp, int, log,
       oct, hex, sin, and sqrt.

       The following operators were also included:

       dec

           $number->dec();
           # $number is smaller by 1.

       "dec" corresponds to "++".  Decrements subject, will decrement character strings too: 'b'
       decrements to 'a'.

       inc

       "inc" corresponds to "++".  Increments subject, will increment character strings too. 'a'
       increments to 'b'.

       mod

       "mod" corresponds to "%".

               $number->mod(5);

       pow

       "pow" returns $number raised to the power of the $exponent.

           my $result = $number->pow($expontent);
           print 2->pow(8);  # 256

       is_number

           $is_a_number = $thing->is_number;

       Returns true if $thing is a number as understood by Perl.

           12.34->is_number;           # true
           "12.34"->is_number;         # also true

       is_positive

           $is_positive = $thing->is_positive;

       Returns true if $thing is a positive number.

       0 is not positive.

       is_negative

           $is_negative = $thing->is_negative;

       Returns true if $thing is a negative number.

       0 is not negative.

       is_integer

           $is_an_integer = $thing->is_integer;

       Returns true if $thing is an integer.

           12->is_integer;             # true
           12.34->is_integer;          # false

       is_int

       A synonym for is_integer.

       is_decimal

           $is_a_decimal_number = $thing->is_decimal;

       Returns true if $thing is a decimal number.

           12->is_decimal;             # false
           12.34->is_decimal;          # true
           ".34"->is_decimal;          # true

       Reference Related Methods

       The following core functions are implemented.

       tie, tied, ref, vec.

       "tie", "tied", and "undef" don't work on code references.

       Array Methods

       Array methods work on both arrays and array references:

         my $arr = [ 1 .. 10 ];
         $arr->undef;

       Or:

         my @arr = ( 1 .. 10 );
         @arr->undef;

       List context forces methods to return a list:

         my @arr = ( 1 .. 10 );
         print join ' -- ', @arr->grep(sub { $_ > 3 }), "\n";

       Likewise, scalar context forces methods to return an array reference.

       As scalar context forces methods to return a reference, methods may be chained

         my @arr = ( 1 .. 10 );
         @arr->grep(sub { $_ > 3 })->min->say;  # "4\n";

       These built-in functions are defined as methods:

       pop, push, shift, unshift, delete, undef, exists, bless, tie, tied, ref, grep, map, join,
       reverse, and sort, each.

       As well as:

       vdelete

       Deletes a specified value from the array.

         $a = 1->to(10);
         $a->vdelete(3);         # deletes 3
         $a->vdelete(2)->say;    # "1 4 5 6 7 8 9 10\n"

       uniq

       Removes all duplicate elements from an array and returns the new array with no duplicates.

          my @array = qw( 1 1 2 3 3 6 6 );
          @return = @array->uniq;    # @return : 1 2 3 6

       first

       Returns the first element of an array for which a callback returns true:

         $arr->first(sub { qr/5/ });

       max

       Returns the largest numerical value in the array.

          $a = 1->to(10);
          $a->max;           # 10

       min

       Returns the smallest numerical value in the array.

          $a = 1->to(10);
          $a->min;           # 1

       mean

       Returns the mean of elements of an array.

          $a = 1->to(10);
          $a->mean;          # 55/10

       var

       Returns the variance of the elements of an array.

          $a = 1->to(10);
          $a->var;           # 33/4

       svar

       Returns the standard variance.

         $a = 1->to(10);
         $a->svar;                     # 55/6

       at

       Returns the element at a specified index. This function does not modify the original
       array.

          $a = 1->to(10);
          $a->at(2);                   # 3

       size, elems, length

       "size", "elems" and "length" all return the number of elements in an array.

          my @array = qw(foo bar baz);
          @array->size;   # 3

       elements, flatten

           my @copy_of_array = $array->flatten;

       Returns the elements of an array ref as an array.  This is the same as "@{$array}".

       Arrays can be iterated on using "for" and "foreach". Both take a code reference as the
       body of the for statement.

       foreach

           @array->foreach(\&code);

       Calls &code on each element of the @array in order.  &code gets the element as its
       argument.

           @array->foreach(sub { print $_[0] });  # print each element of the array

       for

           @array->for(\&code);

       Like foreach, but &code is called with the index, the value and the array itself.

           my $arr = [ 1 .. 10 ];
           $arr->for(sub {
               my($idx, $value) = @_;
               print "Value #$idx is $value\n";
           });

       sum

           my $sum = @array->sum;

       Adds together all the elements of the array.

       count

       Returns the number of elements in array that are "eq" to a specified value:

         my @array = qw/one two two three three three/;
         my $num = @array->count('three');  # returns 3

       to, upto, downto

       "to", "upto", and "downto" create array references:

          1->to(5);      # creates [1, 2, 3, 4, 5]
          1->upto(5);    # creates [1, 2, 3, 4, 5]
          5->downto(5);  # creates [5, 4, 3, 2, 1]

       Those wrap the ".." operator.

       Note while working with negative numbers you need to use () so as to avoid the wrong
       evaluation.

         my $range = 10->to(1);        # this works
         my $range = -10->to(10);      # wrong, interpreted as -( 10->to(10) )
         my $range = (-10)->to(10);    # this works

       head

       Returns the first element from @list.   This differs from shift in that it does not change
       the array.

           my $first = @list->head;

       tail

       Returns all but the first element from @list.

           my @list = qw(foo bar baz quux);
           my @rest = @list->tail;  # [ 'bar', 'baz', 'quux' ]

       Optionally, you can pass a number as argument to ask for the last $n elements:

           @rest = @list->tail(2); # [ 'baz', 'quux' ]

       slice

       Returns a list containing the elements from @list at the indices @indices. In scalar
       context, returns an array reference.

           # Return $list[1], $list[2], $list[4] and $list[8].
           my @sublist = @list->slice(1,2,4,8);

       range

       "range" returns a list containing the elements from @list with indices ranging from
       $lower_idx to $upper_idx. It returns an array reference in scalar context.

           my @sublist = @list->range( $lower_idx, $upper_idx );

       last_index

           my $index = @array->last_index(qr/.../);

       Returns the highest index whose element matches the given regular expression.

           my $index = @array->last_index(\&filter);

       Returns the highest index for an element on which the filter returns true.  The &filter is
       passed in each value of the @array.

           my @things = qw(pear poll potato tomato);
           my $last_p = @things->last_index(qr/^p/); # 2

       Called with no arguments, it corresponds to $#array giving the highest index of the array.

           my $index = @array->last_index;

       first_index

       Works just like last_index but it will return the index of the first matching element.

           my $first_index = @array->first_index;    # 0

           my @things = qw(pear poll potato tomato);
           my $last_p = @things->first_index(qr/^t/); # 3

       at

           my $value = $array->at($index);

       Equivalent to "$array->[$index]".

       Hash Methods

       Hash methods work on both hashes and hash references.

       The built in functions work as normal:

       delete, exists, keys, values, bless, tie, tied, ref, undef,

       at, get

           my @values = %hash->get(@keys);

       Returns the @values of @keys.

       put

           %hash->put(%other_hash);

       Overlays %other_hash on top of %hash.

          my $h = {a => 1, b => 2};
          $h->put(b => 99, c => 3);    # (a => 1, b => 99, c => 3)

       set

       Synonym for put.

       each

       Like "foreach" but for hash references. For each key in the hash, the code reference is
       invoked with the key and the corresponding value as arguments:

         my $hashref = { foo => 10, bar => 20, baz => 30, quux => 40 };
         $hashref->each(sub { print $_[0], ' is ', $_[1], "\n" });

       Or:

         my %hash = ( foo => 10, bar => 20, baz => 30, quux => 40 );
         %hash->each(sub { print $_[0], ' is ', $_[1], "\n" });

       Unlike regular "each", this each will always iterate through the entire hash.

       Hash keys appear in random order that varies from run to run (this is intentional, to
       avoid calculated attacks designed to trigger algorithmic worst case scenario in "perl"'s
       hash tables).

       You can get a sorted "foreach" by combining "keys", "sort", and "foreach":

          %hash->keys->sort->foreach(sub {
             print $_[0], ' is ', $hash{$_[0]}, "\n";
          });

       lock_keys

           %hash->lock_keys;

       Works as "lock_keys" in Hash::Util.  No more keys may be added to the hash.

       slice

       Takes a list of hash keys and returns the corresponding values e.g.

         my %hash = (
             one   => 'two',
             three => 'four',
             five  => 'six'
         );

         print %hash->slice(qw(one five))->join(' and '); # prints "two and six"

       flip

       Exchanges values for keys in a hash:

           my %things = ( foo => 1, bar => 2, baz => 5 );
           my %flipped = %things->flip; # { 1 => foo, 2 => bar, 5 => baz }

       If there is more than one occurrence of a certain value, any one of the keys may end up as
       the value.  This is because of the random ordering of hash keys.

           # Could be { 1 => foo }, { 1 => bar }, or { 1 => baz }
           { foo => 1, bar => 1, baz => 1 }->flip;

       Because references cannot usefully be keys, it will not work where the values are
       references.

           { foo => [ 'bar', 'baz' ] }->flip; # dies

       flatten

           my %hash = $hash_ref->flatten;

       Dereferences a hash reference.

       Code Methods

       Methods which work on code references.

       These are simple wrappers around the Perl core functions.  bless, ref,

       Due to Perl's precedence rules, some autoboxed literals may need to be parenthesized.  For
       instance, this works:

         my $curried = sub { ... }->curry();

       This does not:

         my $curried = \&foo->curry();

       The solution is to wrap the reference in parentheses:

         my $curried = (\&foo)->curry();

       curry

           my $curried_code = $code->curry(5);

       Currying takes a code reference and provides the same code, but with the first argument
       filled in.

           my $greet_world = sub {
               my($greeting, $place) = @_;
               return "$greeting, $place!";
           };
           print $greet_world->("Hello", "world");  # "Hello, world!"

           my $howdy_world = $greet_world->curry("Howdy");
           print $howdy_world->("Texas");           # "Howdy, Texas!"

   What's Missing?
       •   File and socket operations are already implemented in an object-oriented fashion care
           of IO::Handle, IO::Socket::INET, and IO::Any.

       •   Functions listed in the perlfunc headings

           •   "System V interprocess communication functions",

           •   "Fetching user and group info",

           •   "Fetching network info",

           •   "Keywords related to perl modules",

           •   "Functions for processes and process groups",

           •   "Keywords related to scoping",

           •   "Time-related functions",

           •   "Keywords related to the control flow of your perl program",

           •   "Functions for filehandles, files, or directories",

           •   "Input and output functions".

       •   (Most) binary operators

       These things are likely implemented in an object oriented fashion by other CPAN modules,
       are keywords and not functions, take no arguments, or don't make sense as part of the
       string, number, array, hash, or code API.

   Autoboxing
       This section quotes four pages from the manuscript of Perl 6 Now: The Core Ideas
       Illustrated with Perl 5 by Scott Walters. The text appears in the book starting at page
       248. This copy lacks the benefit of copyedit - the finished product is of higher quality.

       A box is an object that contains a primitive variable.  Boxes are used to endow primitive
       types with the capabilities of objects which essential in strongly typed languages but
       never strictly required in Perl.  Programmers might write something like "my $number =
       Int->new(5)".  This is manual boxing.  To autobox is to convert a simple type into an
       object type automatically, or only conceptually.  This is done by the language.

       autoboxing makes a language look to programmers as if everything is an object while the
       interpreter is free to implement data storage however it pleases.  Autoboxing is really
       making simple types such as numbers, strings, and arrays appear to be objects.

       "int", "num", "bit", "str", and other types with lower case names, are primitives.
       They're fast to operate on, and require no more memory to store than the data held
       strictly requires.  "Int", "Num", "Bit", "Str", and other types with an initial capital
       letter, are objects.  These may be subclassed (inherited from) and accept traits, among
       other things.  These objects are provided by the system for the sole purpose of
       representing primitive types as objects, though this has many ancillary benefits such as
       making "is" and "has" work.  Perl provides "Int" to encapsulate an "int", "Num" to
       encapsulate a "num", "Bit" to encapsulate a "bit", and so on.  As Perl's implementations
       of hashes and dynamically expandable arrays store any type, not just objects, Perl
       programmers almost never are required to box primitive types in objects.  Perl's power
       makes this feature less essential than it is in other languages.

       autoboxing makes primitive objects and they're boxed versions equivalent.  An "int" may be
       used as an "Int" with no constructor call, no passing, nothing.  This applies to constants
       too, not just variables.  This is a more Perl 6 way of doing things.

         # Perl 6 - autoboxing associates classes with primitives types:

         print 4.sqrt, "\n";

         print [ 1 .. 20 ].elems, "\n";

       The language is free to implement data storage however it wishes but the programmer sees
       the variables as objects.

       Expressions using autoboxing read somewhat like Latin suffixes.  In the autoboxing mind-
       set, you might not say that something is "made more mnemonic", but has been
       "mnemonicified".

       Autoboxing may be mixed with normal function calls.  In the case where the methods are
       available as functions and the functions are available as methods, it is only a matter of
       personal taste how the expression should be written:

         # Calling methods on numbers and strings, these three lines are equivalent
         # Perl 6

         print sqrt 4;
         print 4.sqrt;
         4.sqrt.print;

       The first of these three equivalents assumes that a global "sqrt()" function exists.  This
       first example would fail to operate if this global function were removed and only a method
       in the "Num" package was left.

       Perl 5 had the beginnings of autoboxing with filehandles:

         use IO::Handle;
         open my $file, '<', 'file.txt' or die $!;
         $file->read(my $data, -s $file);

       Here, "read" is a method on a filehandle we opened but never blessed.  This lets us say
       things like "$file->print(...)" rather than the often ambagious "print $file ...".

       To many people, much of the time, it makes more conceptual sense as well.

       Reasons to Box Primitive Types

       What good is all of this?

       •   Makes conceptual sense to programmers used to object interfaces as the way to perform
           options.

       •   Alternative idiom. Doesn't require the programmer to write or read expressions with
           complex precedence rules or strange operators.

       •   Many times that parenthesis would otherwise have to span a large expression, the
           expression may be rewritten such that the parenthesis span only a few primitive types.

       •   Code may often be written with fewer temporary variables.

       •   Autoboxing provides the benefits of boxed types without the memory bloat of actually
           using objects to represent primitives. Autoboxing "fakes it".

       •   Strings, numbers, arrays, hashes, and so on, each have their own API.  Documentation
           for an "exists" method for arrays doesn't have to explain how hashes are handled and
           vice versa.

       •   Perl tries to accommodate the notion that the "subject" of a statement should be the
           first thing on the line, and autoboxing furthers this agenda.

       Perl is an idiomatic language and this is an important idiom.

       Subject First: An Aside

       Perl's design philosophy promotes the idea that the language should be flexible enough to
       allow programmers to place the subject of a statement first.  For example, "die $! unless
       read $file, 60" looks like the primary purpose of the statement is to "die".

       While that might be the programmers primary goal, when it isn't, the programmer can
       communicate his real primary intention to programmers by reversing the order of clauses
       while keeping the exact same logic: "read $file, 60 or die $!".

       Autoboxing is another way of putting the subject first.

       Nouns make good subjects, and in programming, variables, constants, and object names are
       the nouns.  Function and method names are verbs.  "$noun->verb()" focuses the readers
       attention on the thing being acted on rather than the action being performed.  Compare to
       "$verb($noun)".

       Autoboxing and Method Results

       Let's look at some examples of ways an expression could be written.

         # Various ways to do the same thing:

         print(reverse(sort(keys(%hash))));          # Perl 5 - pathological parenthetic
         print reverse sort keys %hash;              # Perl 5 - no unneeded parenthesis

         print(reverse(sort(%hash,keys))));          # Perl 6 - pathological
         print reverse sort %hash.keys;              # Perl 6 - no unneeded parenthesis

         %hash.keys ==> sort ==> reverse ==> print;  # Perl 6 - pipeline operator

         %hash.keys.sort.reverse.print;              # Perl 6 - autobox

         %hash->keys->sort->reverse->print;          # Perl 5 - autobox

       This section deals with the last two of these equivalents.  These are method calls

         use autobox::Core;
         use Perl6::Contexts;

         my %hash = (foo => 'bar', baz => 'quux');

         %hash->keys->sort->reverse->print;          # Perl 5 - autobox

         # prints "foo baz"

       Each method call returns an array reference, in this example.  Another method call is
       immediately performed on this value.  This feeding of the next method call with the result
       of the previous call is the common mode of use of autoboxing.  Providing no other
       arguments to the method calls, however, is not common.

       "Perl6::Contexts" recognizes object context as provided by "->" and coerces %hash and
       @array into references, suitable for use with "autobox".  (Note that "autobox" also does
       this automatically as of version 2.40.)

       "autobox" associates primitive types, such as references of various sorts, with classes.
       "autobox::Core" throws into those classes methods wrapping Perl's built-in functions.  In
       the interest of full disclosure, "Perl6::Contexts" and "autobox::Core" are my creations.

       Autobox to Simplify Expressions

       One of my pet peeves in programming is parenthesis that span large expression.  It seems
       like about the time I'm getting ready to close the parenthesis I opened on the other side
       of the line, I realize that I've forgotten something, and I have to arrow back over or
       grab the mouse.

       When the expression is too long to fit on a single line, it gets broken up, then I must
       decide how to indent it if it grows to 3 or more lines.

         # Perl 5 - a somewhat complex expression

         print join("\n", map { CGI::param($_) } @cgi_vars), "\n";
         # Perl 5 - again, using autobox:

         @cgi_vars->map(sub { CGI::param($_[0]) })->join("\n")->concat("\n")->print;

       The autoboxed version isn't shorter, but it reads from left to right, and the parenthesis
       from the "join()" don't span nearly as many characters.  The complex expression serving as
       the value being "join()"ed in the non-autoboxed version becomes, in the autoboxed version,
       a value to call the "join()" method on.

       This "print" statement takes a list of CGI parameter names, reads the values for each
       parameter, joins them together with newlines, and prints them with a newline after the
       last one.

       Pretending that this expression were much larger and it had to be broken to span several
       lines, or pretending that comments are to be placed after each part of the expression, you
       might reformat it as such:

         @cgi_vars->map(sub { CGI::param($_[0]) })  # turn CGI arg names into values
                  ->join("\n")                      # join with newlines
                  ->concat("\n")                    # give it a trailing newline
                  ->print;                          # print them all out

       Here ends the text quoted from the Perl 6 Now manuscript.

BUGS

       Yes. Report them to the author, scott@slowass.net, or post them to GitHub's bug tracker at
       <https://github.com/scrottie/autobox-Core/issues>.

       The API is not yet stable -- Perl 6-ish things and local extensions are still being
       renamed.

HISTORY

       See the Changes file.

COPYRIGHT AND LICENSE

       Copyright (C) 2009, 2010, 2011 by Scott Walters and various contributors listed (and
       unlisted) below.

       This library is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself, either Perl version 5.8.9 or, at your option, any later version of
       Perl 5 you may have available.

       This library is distributed in the hope that it will be useful, but without any warranty;
       without even the implied warranty of merchantability or fitness for a particular purpose.

SEE ALSO

       autobox
       Moose::Autobox
       Perl6::Contexts
       <http://github.com/gitpan/autobox-Core>
       IO::Any
       Perl 6: <http://dev.perl.org/perl6/apocalypse/>.

AUTHORS

       Scott Walters, scott@slowass.net.

       Tomasz Konojacki has been assisting with maint.

       Jacinta Richardson improved documentation and tidied up the interface.

       Michael Schwern and the perl5i contributors for tests, code, and feedback.

       JJ contributed a "strip" method for scalars - thanks JJ!

       Ricardo SIGNES contributed patches.

       Thanks to Matt Spear, who contributed tests and definitions for numeric operations.

       Mitchell N Charity reported a bug and sent a fix.

       Thanks to chocolateboy for autobox and for the encouragement.

       Thanks to Bruno Vecchi for bug fixes and many, many new tests going into version 0.8.

       Thanks to <http://github.com/daxim> daxim/Lars DIECKOW pushing in fixes and patches from
       the RT queue along with fixes to build and additional doc examples.

       Thanks to everyone else who sent fixes or suggestions -- apologies if I failed to include
       you here!