@gmod/cram/src/seek-bzip/toHex.ts

read CRAM files with pure Javascript

// from https://www.xaymar.com/articles/2020/12/08/fastest-uint8array-to-hex-string-conversion-in-javascript/

// Pre-Init
const LUT_HEX_4b = [
  '0',
  '1',
  '2',
  '3',
  '4',
  '5',
  '6',
  '7',
  '8',
  '9',
  'A',
  'B',
  'C',
  'D',
  'E',
  'F',
]
const LUT_HEX_8b = new Array(0x100)
for (let n = 0; n < 0x100; n++) {
  LUT_HEX_8b[n] = `${LUT_HEX_4b[(n >>> 4) & 0xf]}${LUT_HEX_4b[n & 0xf]}`
}
// End Pre-Init
export function toHex(buffer: Uint8Array) {
  let out = ''
  for (let idx = 0, edx = buffer.length; idx < edx; idx++) {
    out += LUT_HEX_8b[buffer[idx]!]
  }
  return out
}