// re-inventing the wheel:
export function deepEqual(a, b) {
  if (a === b) return true; // <- shallow equality and primitives
  if (typeof a !== 'object' || typeof b !== 'object' || a === null || b === null) {
    return false;
  }
  if (Array.isArray(a) && Array.isArray(b)) {
    if (a.length !== b.length) return false;
    for (let i = 0; i < a.length; i++) {
      if (!deepEqual(a[i], b[i])) return false;
    }
    return true;
  }
  if (a instanceof Set) {
    if (!(b instanceof Set)) {
      return false;
    }
    if (a.size !== b.size) {
      return false;
    }
    for (const entry of a) {
      if (!b.has(entry)) {
        return false;
      }
    }
    return true;
  }
  const keysA = Object.keys(a);
  const keysB = Object.keys(b);
  if (keysA.length !== keysB.length) return false;
  for (let key of keysA) {
    if (!keysB.includes(key) || !deepEqual(a[key], b[key])) {
      return false;
    }
  }
  return true;
}

// zip two arrays
export function zip(a, b) {
  return a.map((k, i) => [k, b[i]]);
}

export function capitalizeFirstLetter(val) {
  return String(val).charAt(0).toUpperCase() + String(val).slice(1);
}