Course of Raku / Advanced / Operators / Meta-operators / Exercises / Build a URL

Solution: Build a URL

Here is a possible solution to the task.

Code

my @parts = <http :// example .com>;

my $url = [~] @parts;
say $url;
say $url.chars;

🦋 You can find the source code in the file concatenate-a-list.raku.

Output

http://example.com
18

Comments

  1. The array is written with the angle-bracket quoting form <...>, which is the same as 'http', '://', 'example', '.com'.

  2. The reduction meta-operator [~] places the string-concatenation operator ~ between all the elements, so [~] @parts glues the four pieces into the single string http://example.com.

  3. Storing the result in $url lets us reuse it: $url.chars then reports that the assembled URL is 18 characters long.

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