compare-cnab.js

let arquivo = [
  '03300000        2073852501000170461600007633580                         SKILLLINE TECNOLOGIA DA INFORMBanco Santander                         110032021      000408040                                                                          ',
  '03300011R01  030 2073852501000170                    461600007633580     SKILLLINE TECNOLOGIA DA INFORMCobrar Juros 2 am                       Protestar no 10º dia corrido após venc  0000000010032021                                         ',
  '0330001300001P 014616701300030200130003020  0000003064905511  0000000000119352503202100000000020668900000 02N090320213250320210000000000000000000000000000000000000000000000000000000000000000000000000000000000000000006233000300000           ',
  '03399999         000001000172                                                                                                                                                                                                                   ',
]
let docpay = [
  '03300000        2037878691000130000000000000001                         SKILLCONSULTING TECNOLOGIA ...BANCO SANTANDER                         104052021      000101040                                                                          ',
  '03300011R01  030 2037878691000130                    000000000000001     SKILLCONSULTING TECNOLOGIA ...                                                                                0000010104052021                                         ',
  '0330001300001P 014616701300020430130002043  0000000000005511  0000000000062492204202100000000000434400000 02N220420213000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000006249300100000           ',
  '03399999         000001000012                                                                                                                                                                                                                   ',
];  

let get = (line, start, end) => {
  return String(line).substring(start - 1, end);
};

let padStart = (value, size, char = '0') => {
  let fill = Array(size).fill(char).join('');
  return (fill + value).slice(-1 * size);
};

let padEnd = (value, size, char = '0') => {
  let fill = Array(size).fill(char).join('');
  return (value + fill).substr(0, size);
};

let compare = (name, index, start, end) => {
  let block = 40;
  if (!name) {
    console.log(`${padEnd('Local', block, ' ')} - ${padEnd('Arquivo', block, ' ')} - ${padEnd('Docpay', block, ' ')}`);
    return;
  }
  let blockDet = ((end - start) > 40) ? ((end - start) + 10) : block;
  let part0 = `${name} ${padStart(start, 3)}-${padStart(end, 3)}`,
    part1 = `"${get(arquivo[index], start, end)}"`,
    part2 = `"${get(docpay[index], start, end)}"`;
  console.log(`${padEnd(part0, block, ' ')} - ${padEnd(part1, blockDet, ' ')} - ${padEnd(part2, blockDet, ' ')}`);
};
                                                                                                                                                                                                         
compare();
compare('header', 0, 33, 47);
compare('header', 0, 158, 163);
compare('header lote', 1, 34, 53);
compare('header lote', 1, 54, 68);
compare('header lote', 1, 69, 73);
compare('header lote', 1, 184, 191);
compare('segmento P', 2, 33, 41);
compare('segmento P', 2, 43, 44);
compare('segmento P', 2, 63, 77);
compare('segmento P', 2, 107, 108);
compare('segmento P', 2, 196, 220);
compare('segmento P', 2, 225, 225);
compare('segmento P', 2, 228, 229);
compare('trailer', 3, 24, 240);