Method nextHigherKey

packages/db/src/utils/btree.ts:260–263

Returns the next key larger than the specified key, or undefined if there is none. * Also, nextHigherKey(undefined) returns the lowest key.

(key: K | undefined)

   *  Also, nextHigherKey(undefined) returns the lowest key.
   */
  nextHigherKey(key: K | undefined): K | undefined {
    const p = this.nextHigherPair(key, ReusedArray as [K, V])
    return p && p[0]
  }

  /** Returns the next pair whose key is smaller than the specified key (or undefined if there is none).
   *  If key === undefined, this function returns the highest pair.