Condition-checking Memes

The eternal battle between while-do and do-while loops played out through Road Runner and Wile E. Coyote! On the left, Road Runner safely checks the condition (!edge) before running, saving himself from the cliff. Meanwhile, poor Coyote executes run() first and only checks (!edge) after he's already airborne. And that's why you always validate before executing, folks! The difference between falling and living another day is literally one line of code.

The classic Road Runner vs. Wile E. Coyote scenario reimagined as a programming loop disaster! On the left, Road Runner's code uses a proper while (not edge) { run(); } loop that will terminate when reaching the cliff edge. Meanwhile, poor Coyote is using a do { run(); } while (not edge); loop—checking the condition after execution. He's already run off the cliff because his condition check comes too late! The fundamental difference between pre-test and post-test loops perfectly illustrated through cartoon physics. The variable edge isn't even defined until it's too late, and by then gravity.js has already been imported!