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Merge pull request #327 from sidnym-ladrut/i/310/modernize-react-examples--fix-source-refs

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Source Ref Update for "Modernize React Examples"
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tinnus-napbus 2023-04-04 11:08:53 +12:00 committed by GitHub
commit b0101d0dc6
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1 changed files with 10 additions and 1 deletions
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content/guides/core/app-school-full-stack/7-app-logic.md
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@ -208,7 +208,16 @@ useEffect(() => {
if (subEvent.time !== latestUpdate) {
if ("entries" in subEvent) {
setEntries(entries.concat(subEvent.entries));
// NOTE: `BottomScrollListener` can fire on top of `init`, which can
// cause entries to be double loaded; we trim duplicates to avoid overlap
const [existing, incoming] = [entries, subEvent.entries];
const oldestExistingId = existing.length === 0
? Date.now()
: existing[existing.length - 1].id;
let newestIncomingInd = getDataIndex(oldestExistingId, incoming);
newestIncomingInd += newestIncomingInd < incoming.length
&& incoming[newestIncomingInd].id >= oldestExistingId;
setEntries(existing.concat(incoming.slice(newestIncomingInd)));
} else if ("add" in subEvent) {
const { time, add } = subEvent;
const eInd = getDataIndex(add.id, entries);