I had an object which in it had objects which each had an array of objects with 0..n objects. The main object looked something like this:
{
obj1: [{obj1.1}, {obj1.2}, {obj1.3}],
obj2: [{obj2.1}]
obj3: [{obj3.1}, {obj3.2}]
}
Each object (obj1, obj2 and obj3) held a group of common objects in an array of objects. E.g. obj1 has a group of objects in an object array (obj1.1, obj1.2 and obj1.3) all which have a common property that groups them together.
I want to now be able to iterate over each object separately in each object array in order to sum a particular property (which each object has) for each object array.
I have used Object.keys to iterate over each object array, although I still am unable to get a separate summed value per object array.
For example:
{
obj1: [
0: { price: 10 }
1: { price: 10 }
2: { price: 10 }
],
obj2: [
0: { price: 10 }
],
obj3: [
0: { price: 10 }
1: { price: 10 }
]
}
I want to be able to sum the property price for each individual object array. Therefore for obj1 I should have a summed amount of 30. For obj2 I should have a summed amount of 10, and lastly for obj3 I should have a summed amount of 20.
I can iterate over each object array using Object.keys, however as it stands now, when iterating over each individual element in each object array (using a foreach), I am only summing a final amount for all objects in all three object arrays. I.e. I am getting a summed amount of 60.
var total = 0;
for (var key of Object.keys(result)) {
result[key].forEach(element => {
total += element.Price;
});
};
console.log(total);
What could I use to get the three individually summed amounts per object array?
function sum(prices)
{
let total = 0;
prices.forEach((entry) => total += entry.price);
return total;
}
console.log(sum(obj1));
console.log(sum(obj2));
console.log(sum(obj3));
Why was this hard again? You had the right code, just needed to break things out.
Object#entries, get the key-array pairsArray#reduce, iterate over this listArray#reduce, you can calculate the total price and save it as a value for the current keyconst data = {
obj1: [ { price: 10 }, { price: 10 }, { price: 10 } ],
obj2: [ { price: 10 } ],
obj3: [ { price: 10 }, { price: 10 } ]
};
const res = Object.entries(data).reduce((totalMap, [key, arr]) => ({
...totalMap,
[key]: arr.reduce((total, { price }) => total + price, 0)
}), {});
console.log(res);yet here another way to get the result as an array:
let obj={obj1:[{price:10},{price:10},{price:10}],obj2:[{price:10}],obj3:[{price:10},{price:10}]};
let result = Object.entries(obj)
.map(([k,v]) => ( {[k]:v.reduce((acc,e) => acc+=e.price ,0)} ) )
console.log(result)