How to add two arrays in an array of objects

Question

There is an array in which there are objects with an array of data.

You need to get the sum of all elements of the array of objects and add each sum to the object, then you need to get the sum of two objects and also add to the object.

You also need to add the elements from the array of the first object with the elements from the array of the second email and add them to the array with the sum of each property, i.e. a) [1,2,3] and object b) [4,5,6] and add them get the output [5,7,9]

I was able to get the sum of two elements of the array, but the variant turned out to be very wooden, because it is tied to the property of the first object

function chartSumm(arr) { let obj, firstArr = [], lastArr = [], sumArray = [] arr.forEach(function(item, index) { for (let el in item.data) { if (item.label === 'Эккономия на аннуляции') { firstArr = item.data; } else { lastArr = item.data } } }); let firstObjSum = firstArr.reduce(function(prev, curr, index) { return prev + curr }); let twoObjSum = lastArr.reduce(function(prev, curr, index) { return prev + curr }); obj = { 'Цена у стойки': firstObjSum, 'Аннуляция без штрафа': twoObjSum, 'Общая экономия': firstObjSum + twoObjSum }; console.log(obj) } chartSumm([{ label: 'Эккономия на аннуляции', backgroundColor: '#ef9d4d', data: [1000, 400, 1500, 1500, 3000, 4000] }, { label: 'Экономия на цене у стойки', backgroundColor: '#476e8f', data: [1170, 460, 2000, 2500, 2700, 4000] }, ])

since you have different fields in the input objects and on weekends, in any case you will have to link them somehow.
@Grundy Well, I just think there is suddenly a more universal option, because if you add another object, 2 arrays will fly to the second array already)
@Grundy Well, yes, there was also an idea to immediately access the required array without the first cycles, but this is already over the top) but the moment when the first cycle ends I don’t know how else to determine without data binding)
You don’t do anything with this loop, just insert item.data 6 times in firstArr and lastArr .

Accepted Answer · 2017-09-12T10:00:59

Since the labels are different, in any case they will have to register. To make the function more universal (and not for only 2 objects), you can take the result label to the object. I also took the label Общая Экономия separately from the function, but you can also set it inside.

 function chartSumm(arr, sumLabel, elementSumLabel) { var result = {}; result[sumLabel] = 0; result[elementSumLabel] = [0, 0, 0, 0, 0, 0] arr.forEach(function(item, index) { result[item.resultLabel] = 0; for (var i = 0; i < item.data.length; i++) { result[elementSumLabel][i] += item.data[i]; result[item.resultLabel] += item.data[i] } result[sumLabel] += result[item.resultLabel]; }); return result; } var info = chartSumm([{ label: 'Эккономия на аннуляции', resultLabel: 'Цена у стойки', backgroundColor: '#ef9d4d', data: [1000, 400, 1500, 1500, 3000, 4000] }, { label: 'Экономия на цене у стойки', resultLabel: 'Аннуляция без штрафа', backgroundColor: '#476e8f', data: [1170, 460, 2000, 2500, 2700, 4000] }, ], 'Общая экономия', 'Сумма элементов'); console.log(info);

Так же нужно сложить элементы из массива первого объекта с элементами из массива второго эл и добавить в массив с суммой каждого свойства т.е объект а) [1,2,3] и объект б) [4,5,6] сложить их и получить на выходе [ 5,7,9]

How to add two arrays in an array of objects

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