HexDump for TypeScript/Javascript

hexdump.ts

function hexdump (data: Uint8Array, bytesPerLine = 16): string {
  const result: string[] = []

  for (let i = 0; i < data.length; i += bytesPerLine) {
    const chunk = data.slice(i, i + bytesPerLine)

    const address = i.toString(16)
      .padStart(8, '0')

    const hex = Array.from(chunk, byte => byte.toString(16)
      .padStart(2, '0'))
      .join(' ')
      .padEnd((bytesPerLine * 2) + (bytesPerLine - 1))

    const ascii = Array.from(chunk, byte => {
      return (byte >= 32 && byte <= 126)
        ? String.fromCharCode(byte)
        : '.'
    }).join('')
      .padEnd(bytesPerLine)

    result.push(`${address}: ${hex} |${ascii}|`)
  }

  return result.join('\n')
}

/* Output Example
00000000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000080: 00 00 00 00 00 00 00                            |.......         |
*/