Method pack

packages/effect/src/internal/hashMap.ts:747–766

(
    edit: number,
    excludeIdx: number,
    newChild: Node<K, V> | undefined
  )

  }

  private pack(
    edit: number,
    excludeIdx: number,
    newChild: Node<K, V> | undefined
  ): IndexedNode<K, V> {
    const children: Array<Node<K, V>> = []
    let bitmap = 0
    let bit = 1

    for (let i = 0; i < this.children.length; i++) {
      const child = i === excludeIdx ? newChild : this.children[i]
      if (child) {
        children.push(child)
        bitmap |= bit
      }
      bit <<= 1
    }

    return new IndexedNode(edit, bitmap, children)
  }

  iterator(): Iterator<[K, V]> {
    let childIndex = 0