How to group by and sum an array of objects? [duplicate]
Solution 1:
You can loop and sum it up
var array = [
{ Id: "001", qty: 1 },
{ Id: "002", qty: 2 },
{ Id: "001", qty: 2 },
{ Id: "003", qty: 4 }
];
var result = [];
array.reduce(function(res, value) {
if (!res[value.Id]) {
res[value.Id] = { Id: value.Id, qty: 0 };
result.push(res[value.Id])
}
res[value.Id].qty += value.qty;
return res;
}, {});
console.log(result)Fiddle: Fiddle
Solution 2:
var newArr = [];
$.each(array,function(index,element){
if(newArr[element.Id]==undefined){
newArr[element.Id] =0;
}
newArr[element.Id] += element.qty;
});
console.log(newArr);
Demo