我有以下数据:
var foo = [
{'MonthNo' : 03, 'CustomerTypeID' : 1 , 'TotalSales' : 45 },
{'MonthNo' : 03, 'CustomerTypeID' : 2 , 'TotalSales' : 64 },
{'MonthNo' : 03, 'CustomerTypeID' : 4 , 'TotalSales' : 89 },
{'MonthNo' : 03, 'CustomerTypeID' : 5 , 'TotalSales' : 42 },
{'MonthNo' : 04, 'CustomerTypeID' : 1 , 'TotalSales' : 66 },
{'MonthNo' : 04, 'CustomerTypeID' : 2 , 'TotalSales' : 78 },
{'MonthNo' : 04, 'CustomerTypeID' : 5 , 'TotalSales' : 20 },
{'MonthNo' : 04, 'CustomerTypeID' : 6 , 'TotalSales' : 10 }
];
我想把这个转换成下面的
{'MonthNo' : 03, 'CustomerTypeID' : 1 , 'TotalSales' : 198 },
{'MonthNo' : 03, 'CustomerTypeID' : 5 , 'TotalSales' : 42 },
{'MonthNo' : 04, 'CustomerTypeID' : 1 , 'TotalSales' : 144 },
{'MonthNo' : 04, 'CustomerTypeID' : 5 , 'TotalSales' : 20 },
{'MonthNo' : 04, 'CustomerTypeID' : 6 , 'TotalSales' : 10 }
对于每个 MonthNo,除了 CustomerTypeID 5 和 6 之外,我想将 TotalSales 值相加。 例如:CustomerTypeID 1、2、4 的 MonthNo 03,它们的 TotalSales 值总和为 198。类似地,对于 MonthNo 04,CustomerTypeID 1 和 2 的 TotalSales 值加起来为 144。
我试过使用reduce函数
var result = foo.reduce(function(obj,item){
// code here
},{});
但是,我无法将它们分开以获得所需的结果。任何帮助将不胜感激。
最佳答案
您可以检查特殊情况并使用哈希表来引用正确的对象进行计数。
var foo = [{ MonthNo: '03', CustomerTypeID: 1, TotalSales: 45 }, { MonthNo: '03', CustomerTypeID: 2, TotalSales: 64 }, { MonthNo: '03', CustomerTypeID: 4, TotalSales: 89 }, { MonthNo: '03', CustomerTypeID: 5, TotalSales: 42 }, { MonthNo: '04', CustomerTypeID: 1, TotalSales: 66 }, { MonthNo: '04', CustomerTypeID: 2, TotalSales: 78 }, { MonthNo: '04', CustomerTypeID: 5, TotalSales: 20 }, { MonthNo: '04', CustomerTypeID: 6, TotalSales: 10 }],
result = foo.reduce(function (hash) {
return function (r, a) {
var cType = [5, 6].indexOf(a.CustomerTypeID) === -1 ? 1 : a.CustomerTypeID,
key = [a.MonthNo, cType].join('|');
if (!hash[key]) {
hash[key] = { MonthNo: a.MonthNo, CustomerTypeID: cType, TotalSales: 0 };
r.push(hash[key]);
}
hash[key].TotalSales += a.TotalSales;
return r;
}
}(Object.create(null)), []);
console.log(result);
.as-console-wrapper { max-height: 100% !important; top: 0; }
关于Javascript根据条件减少到组对象,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41236554/