THINK OF THE WAY a stretch of grass becomes a road. At first, the stretch is bumpy and difficult to drive over. A crew comes along and flattens the surface, making it easier to navigate. Then, someone pours gravel. Then tar. Then a layer of asphalt. A steamroller smooths it; someone paints lines. The final surface is something an automobile can traverse quickly. Gravel stabilizes, tar solidifies, asphalt reinforces, and now we don’t need to build our cars to drive over bumpy grass. And we can get from Philadelphia to Chicago in a single day. That’s what computer programming is like. Like a
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