JSFiddle - React, Tailwind, and code Playground
JavaScript
const flag = 0;
const a = 49;
let sIdx = flag ? 3 : 2;
const q = Math.floor(a / 10);
const r = a % 10;
console.log(sIdx, q, r)
let l = sIdx;
for(let i=sIdx; i<=a;i++) {
if(0 == (i%9)) {
i++;
console.log(i, l);
}
}