Course of Raku / Objects, I/O, and exceptions / Input and output / File handles / Exercises

Pass a handle to a function

Problem

A file handle is an ordinary value, so you can pass it to a function like any other argument. Write a subroutine log-line that takes a handle and a message, and writes the message to the handle on its own line.

Open log.txt for writing, call log-line three times to record started, working, and done, then close the handle, read the file back, and print its content.

Example

The program prints:

started
working
done

Solution

✅ See the solution

Course navigation

← Solution: Write with a handle   |   Solution: Pass a handle to a function →