Refactoring a function to use guard clauses

guard-clauses.js

function publishTweet(tweet) {

  if (!isLoggedIn()) {
    throw new Error('You need to log in before tweeting');
  }
  if (!tweet) {
    throw new Error("Your tweet is empty, can't publish it");
  }
  if (!isTweetDoubleChecked()) {
    throw new Error('Dont publish without double checking your tweet');
  }

  tweetIt(tweet);
}