Programming

Learn how to undo the most recent local commits in Git using git reset (--soft, --mixed, --hard) or git revert. Step-by-step fixes for wrong files, recovery with reflog, and when to avoid rewriting history. No push needed.

Recover a dropped git stash: find its hash via git stash pop output, git fsck or reflog; inspect with git show/gitk, then apply or recreate the stash ref.

Official C# version history with exact release dates from 1.0 to 12.0. Discover key features per version and why C# 3.5 never existed—shipped with .NET 3.5 but language stayed at 3.0. Complete timeline for developers.

Learn how to add new keys to a Python dictionary using assignment, update(), setdefault(), and merge operators. No dict.add() method—use these efficient idioms for key-value pairs with examples and pitfalls.

Learn to use git add -p for partial commits in Git. Stage only specific lines like 15 out of 30 changes, verify with git diff --staged, and commit cleanly. Perfect for atomic git commits and better code reviews.

Learn the most efficient way to iterate over Java Map entries using entrySet(), Java 8 forEach, and streams. Avoid keySet() lookups for better performance. Covers HashMap ordering and safe removal.

Discover the optimal sock pairing algorithm using in-place sorting like heapsort for O(n log n) time under log-space constraints. Compare with hashing, radix methods, and practical tips for 30 pairs. Relates to element distinctness.

Fix MissingArgumentException when sending 'Null' from AS3 to ColdFusion SOAP: use new String('Null'), CDATA, or server-side checks, and test with SOAP traces.

Learn how to resolve merge conflicts in Git step-by-step. Use git status to spot issues, edit files to remove markers, git add resolved files, and commit. Tips for git mergetool, aborting merges, and prevention.

Learn to break long YAML strings over multiple lines using literal (|) and folded (>) block scalars. Preserve quotes, control newlines with chomping, and avoid concatenation pitfalls for readable YAML configs.

Java compound assignment operators (+=, -=, *=, /=) implicitly cast the promoted result back to the left-hand type, so i += j compiles without an explicit cast.

Learn what metaclasses are in Python, how they work as the class of a class, and their uses like automatic registries, ORM mapping, and framework enforcement. Examples included.

Use git remote set-url to repoint origin from USB to NAS without losing history. Verify with git remote -v and git fetch; reconcile any divergent commits.

Use git clean to remove local untracked files from your Git working tree safely. Learn git clean -n for dry run, -f to force delete, -fd for directories, and -x for ignored files. Essential Git cleanup guide with flags and tips.

JSON files don't support comments natively, causing parser errors with // or /* */. Discover workarounds like JSON5, _comment keys, preprocessing, JSON Schema $comment, and alternatives for adding notes to JSON effectively.

Learn how to revert a Git repository to a previous commit like 0d1d7fc using git reset --hard or git revert commit. Safe methods for local and shared branches, with examples, recovery tips, and git reset head alternatives.

Learn what stack and heap are in programming, their physical location in computer memory, differences in management by OS or runtime, sizes, scope, and why stack is faster. Detailed guide with examples.

Learn to create a VS Code workspace with global toolchains for AVR/STM32, PlatformIO extensions, and project-specific .vscode settings for tasks.json, launch.json, and debugging with Cortex-Debug.