let pyramidLeft = (rows) => { // Increment Star for (let i = 1; i <= rows; i++) { let str = ''; for (let j = 1; j <= i; j++) { str += '*'; } console.log(str); } // Decrement Star for (let i = 0; i <= rows; i++) { let str = Array(rows).join("*"); for (let j = 1; j <= i; j++) { str = str.replace('*', '') } if (str != '') { console.log(str); } } }; pyramidLeft(9);