Course of Raku / Objects, I/O, and exceptions / Exceptions / Catching exceptions with try / Exercises / Catch the error

Solution: Catch the error

Here is a possible solution to the task.

Code

my $ok = try { 6 * 7 };
say $ok;

my $bad = try { die 'broken' };
say $bad.defined;
say $!.message;

🦋 You can find the source code in the file catch-the-error.raku.

Output

42
False
broken

Comments

1. When the block runs without error, try simply evaluates to the block’s value, so $ok holds 42.

2. The die inside the second block throws an exception, so that block evaluates to an undefined value and $bad.defined is False.

3. The caught exception is stored in the special variable $!, and $!.message returns the text it was given, broken.

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