Row of the odd triangle

Row of the odd triangleCodewars

Approach

function getRowStartNum

function oddRow

Solution

JavaScript

const getRowStartNum = (n) => {
  let sum = 1;
  let step = 1;
  
  while (step < n) {
    step += 1;
    sum += (step - 1) * 2;
  }
  
  return sum;
};

const oddRow = (n) => new Array(n).fill(getRowStartNum(n))
  .map((v, i) => v + i * 2);