HTML

Preload + Preconnect for Critical Resources

`<link rel="preload">` fetches a critical asset early (fonts, hero image, above-fold CSS). `preconnect` opens the TCP+TLS handshake to a third-party origin you'll need soon. Both cut perceived load time.

2h ago 0

Bash

Watch a File for Changes (no inotify dep)

inotifywait is great when available, but on systems without inotify-tools you can poll mtime. Cheap enough to use in dev/CI workflows.

2h ago 0

HTML

Favicon Set (SVG + PNG fallbacks)

Modern favicon setup: one SVG that scales, an ICO fallback for old browsers, and an apple-touch-icon for iOS home screens. Skip the 12-file <link> dump from favicon generators of yore.

2h ago 0

Go

Static File Server

`http.FileServer` serves a directory; combine with `http.StripPrefix` to mount it at a URL path. One line for the most common static-asset use case.

2h ago 0

Java

ReentrantLock — Beyond synchronized

`ReentrantLock` does what `synchronized` does, plus: tryLock with timeout, fair queueing, interruptible acquire, multiple condition variables. Use when synchronized's rigidity bites.

2h ago 0

Rust

Atomic Counter (lock-free)

For shared counters and flags, `AtomicU64` / `AtomicBool` etc. are much faster than `Mutex`. Operations like `fetch_add` are single CPU instructions on most architectures.

2h ago 0

Kotlin

observable — Listen for Property Changes

`Delegates.observable(initial) { prop, old, new -> ... }` fires a callback every time the property changes. Useful for state-tracking, simple observability without a full reactive lib.

2h ago 0

Go

sync/atomic — Lock-Free Counter

For simple counters and flags, atomic ops are much faster than `sync.Mutex`. Go 1.19+ added typed wrappers (`atomic.Int64`) — clearer than the raw functions.

2h ago 0

Bash

Backup File With Timestamp

Keep a versioned copy of a config or log before modifying it. Avoid `cp file file.bak` which overwrites old backups; use a date-stamped name.

2h ago 0

SQL

Indexes — B-tree, Partial, Composite

Indexes are the difference between a 50ms query and a 50s one. Composite indexes match queries that filter / sort on the columns in order; partial indexes skip irrelevant rows for big space savings.

2h ago 0

Bash

Read Single Keystroke Without Enter

For menus and confirm prompts where you want one-key response (no need to press Enter). -n 1 reads exactly one character, -s silences the echo.

2h ago 0

Bash

Safe Bash Script Template

Start every script with the same skeleton: strict error mode (errexit, nounset, pipefail), an IFS reset, and a main() function. Catches silent failures that have lost engineers weeks of debugging.

2h ago 0

PHP

Measure Code Block Execution Time

Time a closure with microsecond precision and return both its result and the elapsed milliseconds. Great for quick perf experiments without pulling in a profiler.

2h ago 0

SQL

IS DISTINCT FROM — Null-Safe Equality

`=` returns NULL when either side is NULL. `IS DISTINCT FROM` (and its inverse `IS NOT DISTINCT FROM`) treat NULLs as equal to themselves — the right tool for change detection.

2h ago 0

Bash

Split String into Array on Delimiter

Use IFS + read or readarray to split safely. Don't use word-splitting tricks — they break on edge cases (empty fields, spaces in values).

2h ago 0

Bash

Pad String to Fixed Width

Pad strings left or right so columnar output lines up. printf gets you about 95% of what you need; the helpers wrap it for readability.

2h ago 0

Bash

Disk Space Alert

Cron-friendly script that checks disk usage on each filesystem and emails (or webhooks) if any partition exceeds a threshold.

2h ago 0

Bash

Print Environment Variables Matching Pattern

Quick audit of env vars by prefix — useful when debugging containerized apps that read from `STRIPE_*`, `DB_*`, etc.

2h ago 0

Bash

Tar Archive with Timestamp

Pack up a directory with a date-stamped filename for easy backups. -z for gzip, -j for bzip2, -J for xz (smallest, slowest).

2h ago 0

Bash

Print a Boxed Banner

Wrap a string in a Unicode box for important headers. Auto-sizes to the longest line. Helps milestone messages stand out in long CI logs.

2h ago 0

PHP

Dump Variable to Browser (var_dump replacement)

A nicer var_dump-style dumper that wraps output in <pre> with monospaced font for browser inspection. Drop-in replacement for var_dump while debugging.

2h ago 0

Kotlin

Property Delegation by Map

Delegate a property to a `Map<String, V>` — reading the property fetches by name; writing stores by name. Quick way to back a class with a config map.

2h ago 0

TypeScript

Template Tag for Safe HTML

Build HTML strings with a tagged template literal that auto-escapes every interpolated value. Eliminates a class of XSS bugs without pulling in a templating library.

2h ago 0

Rust

Custom Display + Debug Implementation

`Debug` (for `{:?}`) is usually derived. `Display` (for `{}`) is hand-written and goes through the same `std::fmt::Formatter` API.

2h ago 0

Kotlin

Custom Property Delegate

Any object with `getValue` / `setValue` operator methods can serve as a delegate. Lets you encapsulate cross-cutting behavior (logging, persistence, validation).

2h ago 0

Bash

OS / Distro Detection

Read /etc/os-release for distro info — it's the standard on every modern Linux. Branch deploy scripts on distro to pick apt vs. dnf vs. apk.

2h ago 0

Bash

Detect Whether Running as Root

Several scripts must run as root (or refuse to). EUID is more reliable than `whoami == root` because sudo without -E may change one but not the other.

2h ago 0

SQL

CREATE TABLE with Constraints

Declare data integrity rules right in the schema — primary keys, foreign keys, unique constraints, NOT NULL, CHECK constraints, defaults. The DB enforces them so application bugs can't corrupt your data.

2h ago 0

SQL

RANK / DENSE_RANK

`RANK` leaves gaps after ties (1, 2, 2, 4); `DENSE_RANK` doesn't (1, 2, 2, 3). `ROW_NUMBER` is always unique. Pick by what tied rows should produce.

2h ago 0

TypeScript

Generic Constraints with `extends`

Generics start unbounded — you can't access any properties of `T`. `T extends { … }` adds a constraint so the body can safely use known shape, while callers can still pass in narrower types.

2h ago 0