title: Why does this specific mutation come back true but not the others?
body: <p>Im working on one of the challenges from FCC and Im stuck on this one mutation.</p>
  
  <p>FCC goes through a bunch of other mutations and they all come back correct but this one doesn't and I can't figure out why.</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>function mutation(arr) {
    let arr1 = arr[1].toString().toLowerCase().split("");
    let arr2 = arr[0].toString().toLowerCase();
    for (let i = 0; i &lt; arr2.length; i++) {
      if (arr2.includes(arr1[i]) == false) {
        return false
      } else {
        return true
      }
    }
  }
  console.log(
    mutation(["hello", "hey"])
  );  </code></pre>
  </div>
  </div>
  </p>