Function func_map

src/danfojs-browser/tests/core/series.test.js:863–865

(x)

    it("map series element to a function statement", function () {
      const sf = new dfd.Series([ 1, 2, 3, 4 ]);
      const func_map = (x) => {
        return x + 1;
      };
      const rslt = [ 2, 3, 4, 5 ];
      assert.deepEqual(sf.map(func_map).values, rslt);
    });