JSFiddle - React, Tailwind, and code Playground
JavaScript
let k = 3;
new Array(15).fill(0).forEach((_, i) => {
console.log(new Array(k).fill(0).map((_, l) => new Array(l + i + 1).fill('*').join('')).join('\n'));
k++;
})
let k = 3;
new Array(15).fill(0).forEach((_, i) => {
console.log(new Array(k).fill(0).map((_, l) => new Array(l + i + 1).fill('*').join('')).join('\n'));
k++;
})