Append Multi-Dimension Arrays Horizontally in Blocks

Question

I have several Multi-Dimension Arrays, that I wish to concatenate horizontally. Thinking of the Multi-Dimension Arrays as tables, I want to append each by stacking them horizont

Answer 1

Here's a version with map.

const arr1 = [["A1","B1","C1","D1"],["A2","B2","C2","D2"]]
const arr2 = [["E1","F1","G1","H1"],["E2","F2","G2","H2"]];

const out = arr1.map((arr, i) => {
  return arr.concat(arr2[i]);
});

console.log(out);