问题描述
{
type: 'vehicles',vin: 1234,companyId: 123,_id: 321
}
{
type: 'company',name: 'x company',_id: 123
}
{
type: 'company',name: 'y company',_id: 333
}
我正在尝试并设计地图归约函数以获取每个公司的平均车辆数(allVehicle / allCompany),我想通过调用这样的键来获取价值
key: ["averageVehiclesPerCompany"]
解决方法
以下是计算平均值的完美解决方案
function calcAverage(companies) {
var totalVehicle = 0;
Object.keys(companies).map(function(key,index) {
var vehicle = 0;
if (!!companies[key].vin) {
vehicle = companies[key].vin;
}
totalVehicle += vehicle;
});
return parseFloat(totalVehicle / companies.length).toFixed(2);
}