print the number in this form using javascript display output on console.log

Question

I want to print numbers in this format.

    1
   121
  12321
 1234321
123454321

I wrote a function that prints some numbers but it is not the same as the output. I think the bug is maybe inside one of the for loops. Here's my code:

  var numRows = 5, triangle, start, stop; function pascalRecursive(n, a) { if (n < 2) return a; var prevRow = a[a.length-1]; var curRow = [1]; for (var i = 1; i < prevRow.length; i++) { curRow[i] = prevRow[i] + prevRow[i]; } curRow.push(1); a.push(curRow); return pascalRecursive(n-1, a); } var triangle = pascalRecursive(numRows, [[1]]); for(var i = 0; i < triangle.length; i++) console.log(triangle[i]+"\\n"); 

Answer 1

you could you a map function to increase all the numbers of the previous line by 1 then just stick a 1 to the front and end.

function pascalRecursive(n, a) {
  if (n < 2) return a;

  var prevRow = a[a.length - 1];
  var prevRowIncreased = prevRow.map(x => x + 1);
  a.push([1,...prevRowIncreased,1]);

  return pascalRecursive(n - 1, a);
}