Consider the following array of objects in javascript
const array = [
{ 10205: 2 },
{ 10207: 3 },
{ 10205: 2 },
{ 10207: 1 }
]
I would like to have it converted to
array = [
{ 10205: 4 },
{ 10207: 4 }
]
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I recommend showing the code that you have tried so far as SO isn't a code writing service.imvain2– imvain22022-12-08 22:04:38 +00:00Commented Dec 8, 2022 at 22:04
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There are lots of duplicates on "grouping". Like this one.Andy– Andy2022-12-08 22:07:39 +00:00Commented Dec 8, 2022 at 22:07
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2 Answers
const array = [{ 10205: 2 }, { 10207: 3 }, { 10205: 2 }, { 10207: 1 }];
const newArray = [];
array.forEach((element) => {
const elementKey = Object.keys(element)[0];
const foundIndex = newArray.findIndex((_) => Object.keys(_)[0] === elementKey);
if (foundIndex >= 0) {
newArray[foundIndex] =
{[elementKey]: newArray[foundIndex][elementKey] + element[elementKey]};
} else newArray.push(element);
});
console.log(newArray)
1 Comment
Tyler2P
Your answer could be improved by adding more information on what the code does and how it helps the OP.
Please use reduce function.
const array = [
{ 10205: 2 },
{ 10207: 3 },
{ 10205: 2 },
{ 10207: 1 }
]
console.log(Object.values(array.reduce((acc, el)=>{
Object.keys(el).map((key)=>{
acc[key] = {
[key]: (acc?.[key]?.[key] ?? 0) + el[key],
}
})
return acc;
}, {})));