Function doSet

packages/form-core/src/utils.ts:52–86

(parent?: any)

  const path = makePathArray(_path)

  function doSet(parent?: any): any {
    if (!path.length) {
      return functionalUpdate(updater, parent)
    }

    const key = path.shift()

    if (
      typeof key === 'string' ||
      (typeof key === 'number' && !Array.isArray(parent))
    ) {
      if (typeof parent === 'object') {
        if (parent === null) {
          parent = {}
        }
        return {
          ...parent,
          [key]: doSet(parent[key]),
        }
      }
      return {
        [key]: doSet(),
      }
    }

    if (Array.isArray(parent) && typeof key === 'number') {
      const prefix = parent.slice(0, key)
      return [
        ...(prefix.length ? prefix : new Array(key)),
        doSet(parent[key]),
        ...parent.slice(key + 1),
      ]
    }
    return [...new Array(key), doSet()]
  }

  return doSet(obj)
}