diamond-pattern

diamond.js

const n = 5

for (let i = 1; i <= n; i++){
  for(let j = 1; j <= n - i; j++){
    process.stdout.write(' ')
  }
  for(let k = 0; k < 2 * i - 1; k++){
    process.stdout.write('*')
  }
  console.log()
}

for (let i = 1; i <= n - 1; i++){
  for(let j = 0; j < i; j++){
    process.stdout.write(' ')
  }
  for(let k = (n - i) * 2 - 1; k > 0; k--){
    process.stdout.write('*')
  }
  console.log()
}