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

Solution: Hello, Interpolation!

Code

Here is a possible solution to this problem:

my $name = prompt 'What is your name? ';
say "Hello, $name! Your name has {$name.chars} letters.";

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

Output

Run the program, and it will enter a mode when it waits for your input. After you type the name and press Enter, the program continues and prints the greeting:

$ raku exercises/strings/hello-interpolation.raku
What is your name? Raku
Hello, Raku! Your name has 4 letters.

Comments

Notice that this time, the string is double-quoted. In double quotes, the variable $name is interpolated, so its content is placed into the string. But interpolation can do more than insert a variable: anything in curly braces, like {$name.chars}, is treated as code, executed, and its result is inserted. Here we reuse the chars method to count the letters of the name right inside the greeting.

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