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Up until the 5.10.0 release, there was no switch statement in Perl 5. From 5.10.0 onward, a multi-way branch statement called given / when is available, which takes the following form: use v5.10; # must be present to import the new 5.10 functions given ( expr ) { when ( cond ) { … } default { …
On December 18, 2007, the 20th anniversary of Perl 1.0, Perl 5.10.0 was released. Perl 5.10.0 included notable new features, which brought it closer to Perl 6. These included a switch statement (called "given"/"when"), regular expressions updates, and the smart match operator (~~).
Perl is an open-source programming language whose first version, 1.0, was released in 1987. The following table contains the Perl 5 version history, showing its release versions. Not all versions are covered yet.
10 REM This BASIC program shows the use of the PRINT and GOTO Statements. 15 REM It fills the screen with the phrase "HELLO" 20 PRINT "HELLO" 30 GOTO 20 In later variations, including Quick Basic , Q Basic , Visual Basic (VB), VB.NET , VBScript , FreeBASIC and Gambas , a line comment is delimited with ' (apostrophe).
Perl 5 uses a Bison-generated parser starting in 5.10. [19] The PHP programming language (Zend Parser). PostgreSQL [20] Ruby MRI, the reference implementation of the Ruby programming language, relies on a Bison grammar. [21] syslog-ng uses several Bison grammars assembled together. [22]
5.15 Perl. 5.16 PHP. 5.17 Python. 5.18 ... Another typical response is to implement an explicit state machine in the form of a large and complex switch statement or ...
Learning Perl, also known as the llama book, [1] is a tutorial book for the Perl programming language, and is published by O'Reilly Media. The first edition (1993) was authored solely by Randal L. Schwartz , and covered Perl 4.
Perl Compatible Regular Expressions (PCRE) is a library written in C, which implements a regular expression engine, inspired by the capabilities of the Perl programming language. Philip Hazel started writing PCRE in summer 1997. [ 3 ]