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- isEmpty: checks if sequence has no elements; short-circuits after the first - tryHead: returns first element as option (mirrors Seq.tryHead / alias for tryFirst) - except: filters out elements present in a given collection (mirrors Seq.except) All 276 tests pass (267 pre-existing + 9 new). Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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…→ 4.6.0 - Fix merge conflict in RELEASE_NOTES.md (4.6.0 section had unresolved conflict markers from concurrent PRs #261 and #264 merging into main) - Bump version.props from 4.5.0 to 4.6.0 to cover all unreleased additions merged since the 4.5.0 version bump: - PR #261: findIndex, tryFindIndex, findIndexAsync, tryFindIndexAsync, sortWith - PR #264: isEmpty, tryHead, except All 287 tests pass. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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…OTES.md, bump version 4.5.0 → 4.6.0 (#265) * Prepare release 4.6.0 — fix merge conflict, bump version.props 4.5.0 → 4.6.0 - Fix merge conflict in RELEASE_NOTES.md (4.6.0 section had unresolved conflict markers from concurrent PRs #261 and #264 merging into main) - Bump version.props from 4.5.0 to 4.6.0 to cover all unreleased additions merged since the 4.5.0 version bump: - PR #261: findIndex, tryFindIndex, findIndexAsync, tryFindIndexAsync, sortWith - PR #264: isEmpty, tryHead, except All 287 tests pass. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> * ci: trigger CI checks --------- Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com> Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Summary
Adds three new combinators to
AsyncSeq, filling gaps relative to the standardSeqmodule:isEmptytrueif the sequence is empty; short-circuits after the first elementSeq.isEmptytryHeadoption, orNoneif emptySeq.tryHeadexceptSeq.exceptImplementation Notes
isEmptyis O(1) for non-empty sequences — it advances the enumerator exactly once and disposes it, making it far more efficient thanlength = 0ortoArray().Length = 0.tryHeadis a direct alias for the existingtryFirst, providing the standardSeq-module name. Both names are now available.exceptbuilds aHashSet<'T>from the excluded collection up front (O(n) once), then filters the source in O(1) per element. Requires'T : equality.Test Status
Build: ✅ succeeded (0 errors, 1 pre-existing warning on
groupByAsync)Tests: ✅ 276/276 passed (267 pre-existing + 9 new)
New tests cover:
isEmptyon empty, non-empty, and singleton sequences (3 tests)tryHeadon empty and non-empty sequences (2 tests)exceptwith partial exclusion, no exclusion, full exclusion, and empty source (4 tests)