pascalsTriangle.js

  if (numRows === 0) {
    return [];
  }
  
  var triangle = [[1]];
  
  for(var i = 0; i < numRows - 1; i++ ) {
    var row = [1];
    for(var j = 1; j < triangle[i].length; j++) {
      row[j] = triangle[i][j] + triangle[i][j-1];
    }
    row.push(1);
    triangle.push(row);
  }
  console.log(triangle);
  return triangle;