static removeAll(arrA, arrB) {
    return arrA.filter(function (item) {
      return arrB.indexOf(item) === -1;
    });
  }
Remove all elements contained in one array from another array.

@static
@param {Array} arrA The array to be filtered.
@param {Array} arrB The array containing elements that will be removed from the other array.
@returns {Array} The filtered array.