Hash string

fnv-1a-hash-32.ts

/**
 * FNV-1a 32-bit hash – fast, non-cryptographic, browser-safe.
 * Sufficient for generating repeatable fragment keys.
 */
export const fnv1aHash32 = (str: string): string => {
  let h = 0x811c9dc5; // FNV offset basis
  for (let i = 0; i < str.length; i++) {
    h ^= str.charCodeAt(i);
    h += (h << 1) + (h << 4) + (h << 7) + (h << 8) + (h << 24);
  }
  // Convert to unsigned 32-bit hex and pad to 8 chars
  return (h >>> 0).toString(16).padStart(8, '0');
};