< > BotCompany Repo | #1015111 // LatestAppearance - keeps track of when things appeared last

JavaX fragment (include)

sclass LatestAppearance<A> {
  Set<A> lastSet;
  new Map<A, Long> latestAppearance;

  L<A> recordAndSort(Set<A> set) {
    for (A a : setMinusSet(set, lastSet))
      latestAppearance.put(a, sysNow());
    lastSet = set;
    ret sortedByMapLookupDesc(set, latestAppearance);
  }
}

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