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<p>
The case expression is the most common kind of flow control in Gleam code. It
is similar to `switch` in some other languages, but more powerful than most.
</p>
<p>
It allows the programmer to say "if the data has this shape then run this
code", a process called called <em>pattern matching</em>.
</p>
<p>
Gleam performs <em>exhaustiveness checking</em> to ensure that the patterns in
a case expression cover all possible values. With this you can have confidence
that your logic is up-to-date for the design of the data you are working with.
</p>
<p>
Try commenting out patterns or adding new redundant ones, and see what
problems the compiler reports.
</p>
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