Course of Raku / Objects, I/O, and exceptions / Exceptions / Soft failures / Exercises / A fallback value

Solution: A fallback value

Here is a possible solution to the task.

Code

sub get($x) {
    fail 'bad' if $x == 0;
    return $x;
}

say get(5) // 'default';
say get(0) // 'default';

🦋 You can find the source code in the file fallback-value.raku.

Output

5
default

Comments

1. get(5) returns 5 normally, so // keeps it.

2. get(0) returns an undefined Failure, so // falls back to 'default'. Because a Failure is undefined, // handles it quietly, without throwing.

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