/tags/callbacks/ Recent content in Callbacks on kdsch.org Hugo en k@kdsch.org (Karl Schultheisz) k@kdsch.org (Karl Schultheisz) Tue, 30 Jul 2019 00:00:00 +0000 /post/callback-dragon/ Tue, 30 Jul 2019 00:00:00 +0000k@kdsch.org (Karl Schultheisz) /post/callback-dragon/ <p>I was writing some Core Bluetooth code on iOS when the dragon appeared.</p> <p>A callback looks like a function. But it&rsquo;s not a function; it&rsquo;s an event disguised as a function.</p> <p>Once you know the beast&rsquo;s weakness, it&rsquo;s simple, though not easy.</p> <p>Don&rsquo;t write callbacks. Write code to handle events. <em>All</em> events implicated by a particular objective. That code might be a state machine, or it might be something more complex. It&rsquo;s much easier to debug a state machine than a callback dragon.</p>