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Learn how to get a Unix timestamp in JavaScript using Date.now() for milliseconds or Math.floor(Date.now() / 1000) for seconds. Covers js get timestamp, conversions, Node.js examples, pitfalls, and helper functions for accurate date and time representation.

Understand the difference between px, dp (dip), and sp units in Android UI development. Learn when to use android dp for layouts, android sp for text, and px for pixels, with conversion formulas and best practices.

Reset your local Git branch to exactly match the remote repository using git fetch origin, git reset --hard origin/branch, and git clean -fdx. Discard all local changes safely with step-by-step guide and backups.

Learn mkdir -p equivalents to create a directory and missing parent directories in Linux/macOS, Python (os.makedirs), PowerShell (New-Item), Node.js, Java. Avoid race conditions with exist_ok=True.

Create a local branch (git branch or git checkout -b), then push and set tracking with git push -u origin <branch>. Verify with git branch -vv. Check tracking.

Locate the original Git clone URL for a local repo. Run git remote -v or git remote get-url, or view .git/config to find origin, upstream, and GitHub parent.

Why processing a sorted array is faster: fewer branch mispredictions, improved vectorization and cache locality. C++/Java benchmarks and fixes. Practical fixes.

Step-by-step guide to delete a Git branch both locally and remotely. Use git push origin --delete, git branch -d bugfix, and git fetch --prune to remove branches and prevent reappearing after git pull. Fix common errors.

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.

Efficiently find files containing specific text on Linux with grep, find, and xargs. Tips for system-wide searches, handling binaries and filenames with spaces.

Discover key differences between JavaScript function declarations and function expressions. Explore hoisting, pros, cons, var function() {} vs function name() {}, and real-world use cases for better coding.

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 javascript delete operator, Reflect.deleteProperty, object rest/spread to remove properties. Examples for js delete object, js delete object property, js object delete key without mutating.

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.

Understand HTTP POST vs PUT differences: POST for server-assigned resource creation in collections (non-idempotent), PUT for client-specified URI creation/replacement (idempotent). REST API best practices, RFC guidance, and examples.

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 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.

Check element visibility in jQuery with :visible/:hidden or .is(). Toggle with .hide(), .show(), .toggle() or .toggleClass(). Tips for animation & accessibility

Run OpenWrt in Proxmox on Raspberry Pi 4 and share the Pi's Wi-Fi with a LAN PC. VM import, bridge setup, NAT/masquerade, DHCP and troubleshooting tips.