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aleksb's solution

to Clock in the Raku Track

Published at Jun 29 2020 · 0 comments
Instructions
Test suite
Solution

Note:

This exercise has changed since this solution was written.

Implement a clock that handles times without dates.

You should be able to add and subtract minutes to it.

Two clocks that represent the same time should be equal to each other.

Resources

Remember to check out the Raku documentation and resources pages for information, tips, and examples if you get stuck.

Running the tests

There is a test suite and module included with the exercise. The test suite (a file with the extension `.t6`) will attempt to run routines from the module (a file with the extension `.pm6`). Add/modify routines in the module so that the tests will pass! You can view the test data by executing the command `perl6 --doc *.t6` (* being the name of the test suite), and run the test suite for the exercise by executing the command `prove6 .` in the exercise directory.

Source

Pairing session with Erin Drummond https://twitter.com/ebdrummond

Submitting Incomplete Solutions

It's possible to submit an incomplete solution so you can see how others have completed the exercise.

``````unit class Clock;

has int \$.hour;
has int \$.minute;

constant \$minutes-in-day = 24 * 60;

submethod TWEAK() {
my \$minutes-since-midnight =
(\$!hour * 60 + \$!minute) % \$minutes-in-day;
\$!hour = \$minutes-since-midnight div 60;
\$!minute = \$minutes-since-midnight % 60;
}

method time {
sprintf("%02d:%02d", \$!hour, \$!minute);
}

\$!minute += \$amount;
self.TWEAK();
self
}

method subtract-minutes(\$amount) {
\$!minute -= \$amount;
self.TWEAK();
self
}``````