uint8arrays/src/xor-compare.ts

Utility functions to make dealing with Uint8Arrays easier

/**
 * Compares two Uint8Arrays representing two xor distances. Returns `-1` if `a`
 * is a lower distance, `1` if `b` is a lower distance or `0` if the distances
 * are equal.
 */
export function xorCompare (a: Uint8Array, b: Uint8Array): -1 | 0 | 1 {
  if (a.byteLength !== b.byteLength) {
    throw new Error('Inputs should have the same length')
  }

  for (let i = 0; i < a.byteLength; i++) {
    if (a[i] === b[i]) {
      continue
    }

    return a[i] < b[i] ? -1 : 1
  }

  return 0
}