My issue lies with transforming a JSON structure like the one below:
[{
"groupid": 29,
"percentage": 14
}, {
"groupid": 29,
"percentage": 22
}, {
"groupid": 59,
"percentage": 66,
}]
I am looking to convert it into the format shown below using JavaScript.
{
"29": [14, 22],
"59": [66]
}
Transform the data into an object structure. For each element in the input array, check if there is an array at the specified groupid. If not, create a new array and add the value:
const inputData = [{
"groupid": 29,
"percentage": 14
}, {
"groupid": 29,
"percentage": 22
}, {
"groupid": 59,
"percentage": 66,
}];
const outputData = inputData.reduce((accumulator, { groupid, percentage }) => {
if (!accumulator[groupid]) accumulator[groupid] = [];
accumulator[groupid].push(percentage);
return accumulator;
}, {});
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