/**
 * author: linqian
 * description: 数组操作函数库
 * date： 2021-07-09 09:50
 */
// 从树形数据中递归筛选目标值
function valInDeep(arr = [], val, id, childs) {
    return arr.reduce((flat, item) => {
      return flat.concat(item[id] == val ? item : valInDeep(item[childs] || [], val, id, childs));
    }, []);
  }
  
  // 将树形数据向下递归为一维数组
  function flattenDeep(arr = [], childs) {
    return arr.reduce((flat, item) => {
      return flat.concat(item, item[childs] ? flattenDeep(item[childs], childs) : [] );
    }, []);
  }
  
  // 将树形数据向上将此支线递归为一维数组
  function flattenDeepParents(arr, parent) {
    return arr.reduce((flat, item) => {
      return flat.concat(item[parent] || [], item[parent] ? flattenDeepParents([item[parent]], parent) : [] );
    }, []);
  }
  
  // 根据条件递归祖先元素
  function regDeepParents(row, parent, cb) {
      if(row[parent]){
        cb && cb(row[parent]);
        regDeepParents(row[parent], parent, cb);
      }
  }
  
  export { valInDeep, flattenDeep, flattenDeepParents, regDeepParents }