Discussion on: Reduce is not my best friend(anymore)

[Alfredo Salzillo]

Your problem is that you were using reduce to push all the results in the same object.

To collect you can use Object.assign

function extractData(records) {
  return Object.assign({}, ...records.map(({ id, ...rest}) => ({
    [id]: computeRestFields(rest),
  })));
}
// or
function extractData(records) {
  return records.map(({ id, ...rest}) => ({
    [id]: computeRestFields(rest),
  })).reduce(Object.assign, {});
}

or Object.fromEntries

function extractData(records) {
  return Object.fromEntries(records.map(({ id, ...rest}) => [id, computeRestFields(rest)]));
}

[Lucas Trevisan]

I noticed this as well.

Reduce this many fields at the same object will blow your memory

[Venkatesh KL]

Exactly! I've seen it going crazy high

[Venkatesh KL]

Yeah, I realized that soon after. Thanks