By Allison Randal
ISBN-10: 059600737X
ISBN-13: 9780596007379
The authors, contributors of the middle improvement group for Perl 6, describe the most recent advancements within the layout philosophy, uncomplicated syntax, and subroutines of the project-in specific these in relation to Parrot, the language-dependent digital laptop that may be used to interpret different dynamic languages reminiscent of Python, Tel, Ruby and Java. They comprise descriptions of the most recent enhancements to Apocalypse 12 (objects) in addition to Apocalypse five (regular expressions) and Apocalypse 6 (subroutines). additionally they contain assets programmers and builders can use to give a contribution to the undertaking.
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Additional info for Perl 6 and Parrot Essentials
Example text
This example creates a closure that prints a lexical variable. When the closure is executed (from some other lexical scope), it prints the variable from the scope where it was defined, not the scope where it's executed: my $person = "Zaphod"; $closure = { print $person; } . . my $person = "Trillian"; $closure( ); # prints "Zaphod" The fact that all blocks are closures has some implications. Every block can take arguments. This is how for creates a $_ alias for the iterator variable. Every block defines a lexical scope.
When 'ravenous' { toss('steak'); } print "Inch by inch . . "; } This means the default case isn't really necessary, because any code after the final when just acts like a default. But an explicit default case makes the intention of the code clearer in the pure switch. The difference is also significant when trapping exceptions. 3 later in this chapter. A when statement can also appear outside a given. When it does, it simply smart match against $_. 2 Iteration Iteration constructs allow you to execute a set of statements multiple times.
Or hashlist context with $( . . ), @( . . 8 Bitwise Operators Perl 6 has two sets of bitwise operators, one for integers and one for strings. The integer bitwise operators combine the AND, OR, and XOR relation symbols with the general numeric symbol + (the unary numeric context operator). These are the binary +&, +|, and +^ and the unary +^ for bitwise negation (ones complement). The default integer type in Perl 6 is a signed int, so the results are equivalent to working with the use integer pragma turned on in Perl 5: 40 41 $number = 42 +& 18; # $number is 2 $number = 42 +| 18; # $number is 58 $number = 42 +^ 18; # $number is 56 $number = +^ 42; # $number is -43 The numeric bitwise shift operators shift the value of the left operand by the number of bits in the right operand, either to the left (<<) or to the right (>>): $number = 4 << 1; # $number is 8 $number = 4 >> 1; # $number is 2 The string bitwise operators combine the AND, OR, and XOR relation symbols with the general string symbol ~ (the same symbol as string concatenation and the unary string context operator).
Perl 6 and Parrot Essentials by Allison Randal
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