javascript - 根据属性值对对象进行排序

Question

我有对象数组，我怎样才能搜索所有对象并根据属性值对它们进行分类

 data = [ 
  {key: 1, val: Mon, week: 0},
  {key: 1, val: Wed, week: 0},
  {key: 1, val: Mon, week: 1},
  {key: 1, val: Mon, week: 1}
  {key: 1, val: Mon, week: 2}
]

期望的输出

week0Array = [{key: 1, val: Mon, week: 0},{key: 1, val: Wed, week: 0}]
week1Array = [{key: 1, val: Mon, week: 1}, {key: 1, val: Mon, week: 1} ]
week2Array = [{key: 1, val: Mon, week: 2}]

我试过使用find在 lodash 中不断变得不确定

_.find(collection, [predicate=_.identity], [fromIndex=0])

Answer 1

您可以使用 _.groupBy(collection, [iteratee=_.identity])像这样:

let data = [ 
  {key: 1, val: 'Mon', week: 0},
  {key: 1, val: 'Wed', week: 0},
  {key: 1, val: 'Mon', week: 1},
  {key: 1, val: 'Mon', week: 1},
  {key: 1, val: 'Mon', week: 2}
]

let weekGroups = _.groupBy(data, d => d.week)

console.log(weekGroups[0])
console.log(weekGroups[1])
console.log(weekGroups[2])

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>

请注意 weekGroups 是一个 Object 而不是 Array。