Multiply two matrices represented by 2-dimensional arrays

matrix_multipication.js

function mult(a, b){
  return a.map((row) => {
    return b[0].map((col, j) => {
      return row.reduce((acc, a0, i) => (acc + a0 * b[i][j]), 0);
    });
  })
}

var mat0 = [
  [1, 2, 3, 4],
  [5, 6, 7, 8],
];

var mat1 = [
  [10, 20, 30, 40, 50, 60, 70],
  [11, 21, 31, 41, 51, 61, 71],
  [12, 22, 32, 42, 52, 62, 72],
  [13, 23, 33, 43, 53, 63, 73],
];

mult(mat0, mat1);
// [
//   [120, 220, 320, 420,   520,  620,  720],
//   [304, 564, 824, 1084, 1344, 1604, 1864],
// ]