Course of Raku / Essentials / Variables and data types essentials / Strings / Exercises / Hello, Concatenation!

Solution: Hello, Concatenation!

Code

Here is a possible solution to this problem:

my $name = prompt 'What is your name? ';
my $city = prompt 'Where are you from? ';
say 'Hello, ' ~ $name ~ ' from ' ~ $city ~ '!';

🦋 You can find the source code in the file hello-concatenation.raku.

Output

Run the program, and it will wait for your input twice. After you answer both prompts, the program prints the greeting:

$ raku exercises/strings/hello-concatenation.raku
What is your name? John
Where are you from? Berlin
Hello, John from Berlin!

Comments

This time the greeting is built from five pieces glued together with the ~ operator: three literal strings ('Hello, ', ' from ', and '!') and the two variables between them. They are all concatenated into a single string first, and only then passed to say.

Compare the program with the earlier variant where we passed several strings to the say routine separated by commas:

say 'Hello, ', $name, '!';

There, say received several separate arguments and printed them one after another. Here, we produce one ready-made string ourselves.

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