What does (value, function)(value, function) mean in JS

Question

I was looking at the code of react-heat-layer to see how this works, but I came across this line of code which I can't get:

var roundResults = function roundResults(results) {
  return (0, _lodash4.default)(results, function (result, row) {
    return (0, _lodash2.default)(filterUndefined(row), function (cell) {
      return [Math.round(cell[0]), Math.round(cell[1]), Math.min(cell[2], maxIntensity), cell[3]];
    }).concat(result);
  }, []);
};

What is the value returned when the function roundResults is invoked? 0, _lodash.default, results, function or []? Anyone could tell me the returned value, please?