dragon.js

var slaying = true;
// A bit of new math magic to calculate the odds
// of hitting the dragon. We'll cover this soon!
var youHit;
var damageThisRound;
var totalDamage = 0;

do {
  youHit = Math.floor(Math.random() * 2);

  if (youHit) {
    damageThisRound = Math.floor(Math.random() * 5 + 1);
    
    console.log("You hit the dragon and did " + damageThisRound + " damage!");
    totalDamage += damageThisRound;
    
    if (totalDamage >= 4) {
      console.log("You did it! You slew the dragon!");
      slaying = false;
    }
  } else {
    console.log("The dragon burninates you! You're toast.");
    slaying = false;
  }
} while (slaying)