Unit Tests

[cranberryofdoom]

Hey! This is really neat-- I ran into the same issue and used the snippet of your code to layout the items in my CSS Grid properly.

I also wrote some unit tests, if you'd like to use them.

describe('reorder', function () {
    it('should reorder successfully when rows are divisible', function () {
      const initialArray = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11];
      const endArray = [0, 3, 6, 9, 1, 4, 7, 10, 2, 5, 8, 11];
      expect(reorder(initialArray, 3)).to.have.ordered.members(endArray);
    });
    it('should reorder successfully when rows are not evenly divisible', function () {
      const initialArray = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
      const endArray = [0, 3, 6, 9, 1, 4, 7, 10, 2, 5, 8];
      expect(reorder(initialArray, 3)).to.have.ordered.members(endArray);
    });
    it('should return the same array if num columns are less than array length', function () {
      const initialArray = [0, 1, 2, 3, 4];
      const endArray = [0, 1, 2, 3, 4];
      expect(reorder(initialArray, 5)).to.have.ordered.members(endArray);
    });
  });

[jessekorzan]

@cranberryofdoom thanks so much!