如何使用lodash在数组中查找具有值的对象

Question

给出以下 JS 数组：

vm.todayShifts = [];
vm.todayShifts['am'] = 
    {
      station: "1",
      slots: {
        position: "AO", 
        name: "Person One"
      },
      slots: {
        position: "FF", 
        name: "Person Two"
      },
      slots: {
        position: "PFF", 
        name: "Person Three"
      },
    },
    {
      station: "2",
      slots: {
        position: "AO", 
        name: "Person Four"
      },
      slots: {
        position: "FF", 
        name: "Person Fve"
      },
      slots: {
        position: "PFF", 
        name: "Person Six"
      },
    },
  ],
todayShifts['pm'] = 
    {
      station: "1",
      slots: {
        position: "AO", 
        name: "Person Seven"
      },
      {
        position: "FF", 
        name: "Person Eight"
      },
      {
        position: "PFF", 
        name: "Person Nine"
      },
    },
    {
      station: "2",
      slots: {
        position: "AO", 
        name: "Person Ten"
      },
      {
        position: "FF", 
        name: "Person Eleven"
      },
      {
        position: "PFF", 
        name: "Person Twelve"
      },
    },
  ]

在循环中的某一点，我有 station.id 和 dayPart（am 或 pm）值，我需要查看 todayShift 数组是否包含在适当的 dayPart 中并具有 station.id 值的对象，然后返回该对象（如果存在）。 我用 lodash 试过这个：

      if (typeof vm.todayShifts[dayPart] != 'undefined') {
        var shift = _.find(vm.todayShifts[dayPart], {'station': station.id});
      }

但即使存在符合条件的数据（例如 dayPart="am" 和 station = 1），也不会返回任何内容。

这已经在一个循环中（在一个带有 Angular Bootstrap 日历的自定义单元格模板的单元格修改器中），所以如果我不需要的话，我不想每次都遍历 todayShifts，因为这个控制器将被调用 ~30每页次数。

我很亲近吗？ 或者是否有更简单的方法来检查和获取该对象？

谢谢。

Answer 1

改用函数

var shift = _.find(vm.todayShifts[dayPart], function(shift){ return shift.station ==  station.id });

Answer 2

查看控制台查看结果。

 vm = Object; vm.todayShifts = []; vm.todayShifts['am'] = [ { station: "1", slots: [{ position: "AO", name: "Person One" }, { position: "FF", name: "Person Two" }, { position: "PFF", name: "Person Three" }] }, { station: "2", slots: [{ position: "AO", name: "Person Four" }, { position: "FF", name: "Person Fve" }, { position: "PFF", name: "Person Six" }] }, ], vm.todayShifts['pm'] = [ { station: "1", slots: [{ position: "AO", name: "Person Seven" }, { position: "FF", name: "Person Eight" }, { position: "PFF", name: "Person Nine" }] }, { station: "2", slots: [{ position: "AO", name: "Person Ten" }, { position: "FF", name: "Person Eleven" }, { position: "PFF", name: "Person Twelve" }] } ] function getShift(dayPart, stationId){ if (typeof vm.todayShifts[dayPart] != 'undefined') { var shift = _.filter(vm.todayShifts[dayPart], {'station': stationId}); return shift; } } var ob = getShift("pm", "2"); console.log(ob);

 <script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>