print_2d_grid.js

const print2dGrid = (grid, pad = 2) => {
  const p = ' '.repeat(pad);
  console.log(['', ...grid.map(r => r.map(n => (p+n).substr(-pad)).join` `), ''].join`\n`);
};

const square = [
    [1, 2, 3, 6, 2, 8, 1],
    [4, 8, 2, 4, 3, 1, 9],
    [1, 5, 3, 7, 9, 3, 1],
    [4, 9, 2, 1, 6, 9, 5],
    [7, 6, 8, 4, 7, 2, 6],
    [2, 1, 6, 2, 4, 8, 7],
    [8, 4, 3, 9, 2, 5, 8]];
    
print2dGrid(square);