This works, but I was wondering if there was a better way than creating a string with a
and b
and later splitting it:
const data = [
{ a: 10, b: 20, c: 30, d: 40 },
{ a: 10, b: 20, c: 31, d: 41 },
{ a: 12, b: 22, c: 32, d: 42 }
];
d3.rollups(
data,
x => ({
c: x.map(d => d.c),
d: x.map(d => d.d)
}),
d => `${d.a} ${d.b}`
)
.map(([key, values]) => {
const [a, b] = key.split(' ');
return {a, b, ...values};
});
// OUTPUT
// [
// {a: "10", b: "20", c: [30, 31], d: [40, 41]},
// {a: "12", b: "22", c: [32], d: [42]}
// ]
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