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JavaScript check if first string contains all characters of second string

Return true if the string in the first element of the array contains all of the letters of the string in the second element of the array. 
<script>
console.log(stringContainString(["Alien", "line"]));    // true
console.log(stringContainString(["zyxwvutsrqponmlkjihgfedcba", "qrstu"]));    // true
console.log(stringContainString(["Hello", "hey"]));    // false

function stringContainString(arr) {
  return arr[1].toLowerCase()
    .split('')
    .every(function(letter) {
      return arr[0].toLowerCase()
        .indexOf(letter) != -1;
    });
}
</script>
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