문제

https://www.acmicpc.net/problem/11721

풀이

const fs = require('fs')
const input = fs.readFileSync('/dev/stdin').toString().trim()

const solution = (input) => {
  let arr = ''
  for(let i=0; i<input.length; i+=10){
    arr += '\n' + input.slice(i, i+10)
  }
  return arr.slice(1)
}
console.log(solution(input))

풀이2

const input = 'Baekjunonline'

const solution = (input) => {
	return input.split('')
      			.map((e, i) => (i % 10 === 0 ? '\n' : '') + e)
      			.join('').trim()
}

console.log(solution(input));