let star = 5;
let result = "";

for (let i = 1; i < star * 2; i += 2) {
  // console.log(i);
  
  for (let j = 1; j < ((star * 2) - i) / 2; j++) {
    result += " ";
  }
  for(let l = 1; l <= i; l++){
    result += "*";
  }
  for (let k = 1; k < ((star * 2) - i) / 2; k++) {
    result += " ";
  }
  
  console.log(result);
  
  result = "";
}