String to random number

random.js

const randomNumber = (string) => string
  .split('')
  .reduce((acc, char) => (acc * char.charCodeAt(0)) % 0xffffffff, 1);

// From https://github.com/airbnb/react-sketchapp/blob/master/src/jsonUtils/models.js

const lut = [];
for (let i = 0; i < 256; i += 1) {
  lut[i] = (i < 16 ? '0' : '') + i.toString(16);
}

// Hack (http://stackoverflow.com/a/21963136)
function e7(seedString) {
  const s1 = randomNumber(seedString);
  const s2 = randomNumber(seedString.split('').reverse().join(''))
  const d0 = s1 | 0;
  const d1 = s2 | 0;
  const d2 = s1 | 0;
  const d3 = s2 | 0;
  return `${lut[d0 & 0xff] +
    lut[(d0 >> 8) & 0xff] +
    lut[(d0 >> 16) & 0xff] +
    lut[(d0 >> 24) & 0xff]}-${lut[d1 & 0xff]}${lut[(d1 >> 8) & 0xff]}-${
    lut[((d1 >> 16) & 0x0f) | 0x40]
  }${lut[(d1 >> 24) & 0xff]}-${lut[(d2 & 0x3f) | 0x80]}${lut[(d2 >> 8) & 0xff]}-${
    lut[(d2 >> 16) & 0xff]
  }${lut[(d2 >> 24) & 0xff]}${lut[d3 & 0xff]}${lut[(d3 >> 8) & 0xff]}${lut[(d3 >> 16) & 0xff]}${
    lut[(d3 >> 24) & 0xff]
  }`;
}