'use strict'

module.exports = visitChildren

function visitChildren(callback) {
  return visitor

  // Visit `parent`, invoking `callback` for each child.
  function visitor(parent) {
    var index = -1
    var children = parent && parent.children

    if (!children) {
      throw new Error('Missing children in `parent` for `visitor`')
    }

    while (++index in children) {
      callback(children[index], index, parent)
    }
  }
}