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lazy-collections has pipelines which don't seem to be doing what's intended #240
Description
E.g., this:
const doubleFibonaccis = pipe(
fibonacci(),
take(78),
windows(3),
flatMap(x => x * 2),
unique(),
toArray(),
);
after windows(3), every element is a 3-element array, so flatMap just produces NaNs, and it goes downhill from there. In the end, doubleFibonaccis() is just [NaN].
It's hard to say what the intention is; based on the name doubleFibonaccis it's maybe just this:
const doubleFibonaccis = pipe(
fibonacci(),
take(78),
flatMap(x => x * 2),
unique(),
toArray(),
);
unless you want to have windows(3) in there? In that case, you could also do:
const doubleFibonaccis = pipe(
fibonacci(),
take(78),
windows(3),
flatMap(window => window.map(x => x * 2)),
unique(),
toArray()
);
Activity
camillobruni commentedon Feb 18, 2026
As per meeting discussion, going to fix this v4.