Course of Raku / Essentials / Scalar variables / Exercises / Correct the identifiers

Solution: Correct the identifiers

There is more than one way to make the identifiers correct. Some possible options are shown here:

Code

my $AGE = 30;
my $Name = 'Valdis';
my $Middle'Name = 'C.';
my $address2 = 'Second street, 12';
my $from-to = 'London to Paris';

All the identifiers are valid, but it is probably better to avoid names with apostrophes if you $don't have strong reasons to use them.

🦋 You can find the source code in the file identifiers.raku.

Output

This program does not generate any output, but you should not get any errors when Rakudo compiles and runs it:

$ raku exercises/scalar-variables/identifiers.raku

Comments

Let us list the problems with the original names:

1. Spaces are not allowed: $ A G E.
2. A variable needs a sigil: Name (it is possible to have sigilless variables in Raku, but they still cannot be declared as my Name).
3. An apostrophe (a single quote, actually) cannot start a name: $'Middle'Name.
4. A digit cannot start a name either: $2address.
5. Two hyphens cannot sit together: $from--to.

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