Programming

Plain-English guide to Big O notation and algorithm complexity. Learn common time complexities (O(1), O(log n), O(n), O(n^2)) and simple rules of thumb.

Fast, idiomatic ways to check if a string contains a substring in Bash. Use [[ *substring* ]], case, or =~ for regex. Also covers quoting and portability.

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

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.

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.

Learn how to generate random numbers in a specified range in JavaScript using Math.random(). Get random integers inclusive or exclusive, floats, and secure options with code examples for dice rolls and more.

Learn to view Git stash contents without applying using git stash list for inventory, git stash show for summaries, and git stash show -p for full diffs. Safe inspection of changes, untracked files, and advanced tips for Git workflows.

Pass and access Node.js command line arguments with process.argv. Examples for positional args, path resolution, validation, and when to use minimist or yargs.

Learn why using async/await inside JavaScript forEach doesn't wait for promises, causing unhandled rejections and early completion. Fix with for...of, Promise.all, Promise.allSettled for sequential, parallel processing.

List files in a directory with Python. Examples use os.listdir, pathlib, glob, and os.scandir. Store results in a list, filter by extension, and recurse.

Pretty-print JSON in shell scripts using jq, Python's json.tool, php or json_pp. One-line examples for bash, curl, NDJSON and safe in-place file updates.

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 how to view complete Git file history including content changes using git log -p -- file, git show for specific commits, and git diff tools. See exact diffs, patches, and file snapshots in each commit.

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

Easily undo a git rebase with multiple commits using git reflog to find the pre-rebase state and git reset --hard to recover your branch. Skip manual cherry-picking for fast, error-free recovery.

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.

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.

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.

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.