#abstraction

"Let's take a moment to ponder this version and the Alto version, and just how many wasted instructions, layers of abstraction, frameworks, toolkits and outright cruft have gotten between the algorithm and the frame buffer in the intervening twenty-seven years. This program makes my phone hot. Hot, I tell you. "

"I hope you're convinced, by now, that programming languages with first-class functions let you find more opportunities for abstraction, which means your code is smaller, tighter, more reusable, and more scalable."