crc32hash.js

const hash = (() => {
  const makeCRCTable = () => {
    let c
    const crcTable = []
    for(let n = 0; n < 256; n++) {
      c = n;
      for(let k = 0; k < 8; k++) {
        c = ((c&1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1))
      }
      crcTable[n] = c
    }
    return crcTable
  }

  const crcTable = makeCRCTable()

  const crc32 = (str) => {
    let crc = 0 ^ (-1)

    for (let i = 0; i < str.length; i++ ) {
      crc = (crc >>> 8) ^ crcTable[(crc ^ str.charCodeAt(i)) & 0xFF]
    }

    return (crc ^ (-1)) >>> 0
  }

  return (string) => {
    return crc32(string).toString(16)
  }

})()

hash('Helo World')