jashkenas--coffeescript/documentation/js/existence.js

var footprints, solipsism;
if ((typeof mind != "undefined" && mind !== null) && !(typeof world != "undefined" && world !== null)) {
  solipsism = true;
}
typeof speed != "undefined" && speed !== null ? speed : speed = 75;
footprints = typeof yeti != "undefined" && yeti !== null ? yeti : "bear";