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romayn

第 134 题：求两个日期中间的有效日期

![image](https://user-images.githubusercontent.com/25046000/64084711-8bf2a400-cd60-11e9-9bdc-a265ff520395.png)

第 125 题：如何将 [{id: 1}, {id: 2, pId: 1}, ...] 的重复数组（有重复数据）转成树形结构的数组 [{id: 1, child: [{id: 2, pId: 1}]}, ...] （需要去重）

arrayToTree([...new Set(array.map(JSON.stringify))].map(JSON.parse)) function arrayToTree(data, nodesField, idField, parentIdField) { if (!nodesField) nodesField = 'children'; idField = idField || '_id'; parentIdField = parentIdField || '_pid'; var nodes = []; var idHash =...