Git2026-11-08
Explain Git Ignore Decisions with git check-ignore
Inspect the matching rule and distinguish an ignored file, a negated pattern and an unmatched path.
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Python2026-11-08
Reject Duplicate CSV Headers Before Building Python Dictionaries
Validate a CSV table's headers and row widths while preserving quoted commas and multiline fields.
Read tutorialPHP2026-11-08
Split Integer Cents in PHP Without Losing the Remainder
Allocate a nonnegative amount across a group and verify that every cent is preserved.
Read tutorialJava2026-11-08
Reject Missing and Ambiguous Local Times Before Scheduling in Java
Use ZoneRules to require exactly one valid offset before converting a local appointment time into an instant.
Read tutorialnode.js2026-11-08
Bound AI Generation Concurrency with a Node.js Worker Pool
Run a finite batch of simulated generation jobs with a tested concurrency limit and stable result order.
Read tutorialPython2026-11-08
Dispatch AI Tool Calls Through a Read-Only Python Allowlist
Connect a fixture tool-call envelope to a real inventory lookup without evaluating model-supplied code.
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AI2026-11-08
Chunk RAG Source Text While Preserving Verifiable Offsets
Create overlapping text windows with source offsets and test reconstruction, Unicode handling and termination.
Read tutorialAI2026-11-08
Measure AI Abstention Separately from Answer Accuracy
Build an offline evaluator that distinguishes unanswered questions, incorrect answers and unsupported answers.
Read tutorialJava2026-11-07
List.copyOf vs Collections.unmodifiableList: A Runnable Java Comparison
See the difference between a snapshot and a read-only view by mutating the original list after creating both.
Read tutorialLinux2026-11-07
Find Recent Service Errors with journalctl on Linux
Filter a systemd service journal by unit, time range and priority without dumping the entire server log.
Read tutorialGit2026-11-07
Unstage a File in Git Without Losing Your Local Changes
Use a disposable repository to see the difference between the index and working tree when git restore --staged runs.
Read tutorialMySQL2026-11-07
Use a MySQL Composite Index for Category and Date Pagination
Create a disposable tutorial table and compare a category-and-date query plan with a matching composite index.
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