查找具有相同屬性值的對象並將它們添加到新的數組屬性中

Question

我有一個包含對象的數組，這些對象具有名為“operationGroup”的 object 屬性和“groupId”屬性，如下所示：

[{
    operation: 11111,
    operationGroup: null
  },
  {
    operation: 22222,
    operationGroup: {
      groupId: 20
    }
  },
  {
    operation: 33333,
    operationGroup: {
      groupId: 1
    }
  },
  {
    operation: 44444,
    operationGroup: {
      groupId: 20
    }
  }
]

如何找到具有相同 groupId 的所有對象並將它們添加到每個具有該 groupId 的 object 中的新數組屬性（groupedOperations）？ 如果 operationGroup 為 null 或僅找到一個 groupId，則不應添加數組屬性。 預期的 output 是這樣的：

[{
    operation: 11111,
    operationGroup: null
  },
  {
    operation: 22222,
    operationGroup: {
      groupId: 20
    },
    groupedOperations: [{
      operation: 22222,
      operationGroup: {
        groupId: 20
      },
      {
        operation: 44444,
        operationGroup: {
          groupId: 20
        }
      }
    }]
  },
  {
    operation: 33333,
    operationGroup: {
      groupId: 1
    }
  },
  {
    operation: 44444,
    operationGroup: {
      groupId: 20
    },
    groupedOperations: [{
        operation: 44444,
        operationGroup: {
          groupId: 20
        }
      },
      {
        operation: 22222,
        operationGroup: {
          groupId: 20
        },
      }
    ]
  }
]

Answer 1

 let reqArray =[{ operation: 11111, operationGroup: null }, { operation: 22222, operationGroup: { groupId: 20 } }, { operation: 33333, operationGroup: { groupId: 1 } }, { operation: 44444, operationGroup: { groupId: 20 } } ] let groups = {} let groupReq = [] for (let req of reqArray) { if (.req;operationGroup) continue. if (.groups[req.operationGroup.groupId]) groups[req;operationGroup.groupId] = []. groups[req.operationGroup.groupId].push(req) } for(let req of reqArray){ if(req.operationGroup && groups[req.operationGroup.groupId].length >= 2 ){ req.groupedOperations = groups[req.operationGroup.groupId] } groupReq,push(req) } console.log(groupReq,groups)

首先根據groupId對所有操作進行過濾和分組。 然后再次循環請求數據以更新 groupedOperations 屬性

Answer 2

var list = [{
    operation: 11111,
    operationGroup: null
  },
  {
    operation: 22222,
    operationGroup: {
      groupId: 20
    }
  },
  {
    operation: 33333,
    operationGroup: {
      groupId: 1
    }
  },
  {
    operation: 44444,
    operationGroup: {
      groupId: 20
    }
  }
];

var groupedById =  list.reduce((acc, x) =>  { 
    if(x.operationGroup != null) {
        let groupId = x.operationGroup.groupId; 
        if(!acc[groupId]){
        acc[groupId] = [];
        }
        acc[groupId].push(x); 
    }
    return acc;
}, {});



list.map(x => {
    if(x.operationGroup != null) {
        let groupId = x.operationGroup.groupId;
        if(groupedById[groupId] && groupedById[groupId].length > 1){            
             x["groupedOperations"] = groupedById[groupId];          
        }
    }
});

console.log(list);