Exceptions: Difference between revisions

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(formerly Perl 6)

The ~~Perl 6~~ equivalent to Perl 5's eval {...} is try {...}. A try block by default has a CATCH block that handles all fatal exceptions by ignoring them. If you define a CATCH block within the try, it replaces the default CATCH. It also makes the try keyword redundant, because any block can function as a try block if you put a CATCH block within it. The inside of a CATCH functions as a switch statement on the current exception.

The Raku equivalent to Perl 5's eval {...} is try {...}. A try block by default has a CATCH block that handles all fatal exceptions by ignoring them. If you define a CATCH block within the try, it replaces the default CATCH. It also makes the try keyword redundant, because any block can function as a try block if you put a CATCH block within it. The inside of a CATCH functions as a switch statement on the current exception.

<lang perl6>try {

die "Help I'm dieing!";

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</pre>

~~Perl 6~~ comes with [http://design.~~perl6~~.org/S04.html#Phasers phasers], that are called when certain conditions in the life of a program, routine or block are met. <tt>CATCH</tt> is one of them and works nicely together with <tt>LEAVE</tt> that is called even if an exception would force the current block to be left immediately. It's a nice place to put your cleanup code.

Rake comes with [http://design.raku.org/S04.html#Phasers phasers], that are called when certain conditions in the life of a program, routine or block are met. <tt>CATCH</tt> is one of them and works nicely together with <tt>LEAVE</tt> that is called even if an exception would force the current block to be left immediately. It's a nice place to put your cleanup code.

<lang perl6>sub f(){