Return of the Clocks
Timepieces, lesson 3: Keeping
Last time, Chris left you with a blank drawing window, and now it’s time to turn it into a clock. This lesson we use
timelibrary to get the time and display it as a string;
stmpackage to give the application some mutable state;
- some basic concurrency primitives to start a thread that will advance the clock; and
pangopackage to set the font.
Now we have a clock! Along the way, we talk about the drawing process and the concept of invalidating areas of the window in order to repaint them.
Functortown, lesson 7: The laws of the bifunctors
This lesson is all about the
Bifunctor laws and property testing them. Since the
Bifunctor laws are similar to the
Functor laws, we also spend a good portion of this lesson familiarizing ourselves with aspects of the
hedgehog testing library, especially ranges and the concept of shrinking.