Course of Raku / Advanced / Subroutines / Nested subroutines / Exercises

Closing over the outer

Problem

A nested subroutine is a closure: it can see the variables of the subroutine that contains it. Write a subroutine greet($name) that defines a nested helper message taking no arguments. The helper returns "Hello, $name!", reading $name straight from the enclosing greet. Inside greet, print what message returns, and call greet('Anna').

Example

The program prints:

Hello, Anna!

Solution

✅ See the solution

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