Course of Raku / Advanced / Containers / Introspecting containers / Exercises / What is it

Solution: What is it

Here is a possible solution to the task.

Code

my $a = 42;
my $b = 'x';

say $a.WHAT === Int;
say $b.WHAT === Int;

🦋 You can find the source code in the file what-is-it.raku.

Output

True
False

Comments

1. $a.WHAT is not the string Int but the actual Int type object, so === Int compares it against the type itself and returns True.

2. $b holds a string, so its WHAT is Str; comparing that with Int gives False. This is what makes WHAT useful in conditions, not just in printouts.

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