perl-Try-Tiny

This module provides bare bones 'try'/'catch'/'finally' statements that are designed to minimize common mistakes with eval blocks, and NOTHING else. This is unlike TryCatch which provides a nice syntax and avoids adding another call stack layer, and supports calling 'return' from the 'try' block to return from the parent subroutine. These extra features come at a cost of a few dependencies, namely Devel::Declare and Scope::Upper which are occasionally problematic, and the additional catch filtering uses Moose type constraints which may not be desirable either. The main focus of this module is to provide simple and reliable error handling for those having a hard time installing TryCatch, but who still want to write correct 'eval' blocks without 5 lines of boilerplate each time. It's designed to work as correctly as possible in light of the various pathological edge cases (see BACKGROUND) and to be compatible with any style of error values (simple strings, references, objects, overloaded objects, etc). If the 'try' block dies, it returns the value of the last statement executed in the 'catch' block, if there is one. Otherwise, it returns 'undef' in scalar context or the empty list in list context. The following examples all assign '"bar"' to '$x': my $x = try { die "foo" } catch { "bar" }; my $x = try { die "foo" } || "bar"; my $x = (try { die "foo" }) // "bar"; my $x = eval { die "foo" } || "bar"; You can add 'finally' blocks, yielding the following: my $x; try { die 'foo' } finally { $x = 'bar' }; try { die 'foo' } catch { warn "Got a die: $_" } finally { $x = 'bar' }; 'finally' blocks are always executed making them suitable for cleanup code which cannot be handled using local. You can add as many 'finally' blocks to a given 'try' block as you like. Note that adding a 'finally' block without a preceding 'catch' block suppresses any errors. This behaviour is consistent with using a standalone 'eval', but it is not consistent with 'try'/'finally' patterns found in other programming languages, such as Java, Python, Javascript or C#. If you learned the 'try'/'finally' pattern from one of these languages, watch out for this.