function promptDirection(question) {
  let result = prompt(question)
  if (result.toLowerCase() == "left") return "L"
  if (result.toLowerCase() == "right") return "R"
  throw new Error("Invalid direction: " + result)
}

function look() {
  if (promptDirection("Which way?") == "L") {
    return "a house"
  } else {
    return "two angry bears"
  }
}

try {
  console.log("You see", look())
} catch (error) {
  console.log("Something went wrong: " + error)
}