code: function explodeArray(xs) {
      return xs.reduce((accumulator, x) => {
          accumulator.push([x]);
          return accumulator;
      }, []);
  }
docs: ------------------------------------------------------------------------------ Helpers ------------------------------------------------------------------------------ 
  Wrap all of the elements of an array into arrays.
  @param   {*[]}     xs Any array.
  @returns {Array[]}    An array of arrays.