group attribute array
function groupBy() {
const key = 'make';
return cars.reduce((acc, x) => ({
...acc,
[x[key]]: (!acc[x[key]]) ? [{
model: x.model,
year: x.year
}] : [...acc[x[key]], {
model: x.model,
year: x.year
}]
}), {})
}
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