code: function arrayContainsAllElementsOfArray(smaller, larger) {
    return smaller.reduce((prev, element) => {
      return prev && larger.indexOf(element) >= 0;
    }, true);
  }
docs: Verify that one array contains all the elements of another
  
  @example
  const smaller = ['a'];
  const larger = ['b'];
  
  arrayContainsAllElementsOfArray(smaller, larger);
  // => true
  
  @param {array} smaller the array to ensure is contained by the other
  @param {array} larger the array to ensure contains the other
  @return {boolean}