firTreeOneLoop

let height = +prompt('enter tree height:')

for (let row = 0, stars = 1, space = height - 1;
 row < height; row++, stars += 2, space -= 1) {
    console.log(' '.repeat(space) + '*'.repeat(stars) + ' '.repeat(space) +
      '" "=' + space + ' *=' + stars);
}
console.log(' '.repeat(height - 1) + '*') // foot