PHP

Recursive Directory Walker

Yield every file under a directory using a generator and SPL's RecursiveIteratorIterator. Filter by extension or any other predicate without slurping all paths into memory first.

5h ago 0

Bash

Download with Progress Bar

Show a progress bar for long downloads. wget gives a great built-in bar; curl needs an explicit flag.

5h 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).

5h ago 0

Go

Variadic Functions

`...T` in the last parameter slot accepts zero or more T values. Pass a slice by suffixing with `...` to spread it. Used everywhere from `fmt.Println` to custom builders.

5h ago 0

Go

Signal Handling with signal.NotifyContext

Go 1.16+ `signal.NotifyContext` returns a context that's canceled on the listed signals. Cleaner than the legacy `signal.Notify(channel)` dance for graceful shutdown.

5h ago 0

PHP

Generate Identicon Avatar

Render a deterministic 5x5 symmetric "identicon" placeholder avatar from any seed (usually a user's email or username). No external service — pure GD.

5h ago 0

Bash

Sum a Column with awk

Awk's default field splitter is whitespace; pass a single character with -F. Perfect for summing the Nth column of a log file or CSV.

5h ago 0

Bash

Get Public IP Address

Several free services return your public IP as plain text. Useful when scripts running behind NAT need to know what address the outside world sees.

5h ago 0

Bash

Check Systemd Service Is Running

`systemctl is-active` is the right tool — exit code 0 if running, non-zero otherwise. Combine with restart-on-fail for poor-man's supervision.

5h ago 0

Bash

Create User With Sensible Defaults

Provision a new user account with a home directory, default shell, and sudo membership. Idempotent — re-running on an existing user is a no-op.

5h ago 0

Rust

windows / chunks — Sliding & Fixed

`windows(n)` yields every overlapping sub-slice of length n; `chunks(n)` yields non-overlapping chunks. Both work on slices for free, no extra crates.

5h ago 0

Go

Generic Set Type

A type-safe Set built on `map[T]struct{}` and Go generics. Has Add / Has / Delete / Size — and uses zero bytes per entry for the value side.

5h ago 0

Go

database/sql — Open + Query

`database/sql` is driver-agnostic — pick a driver (`pgx/stdlib`, `go-sql-driver/mysql`, `mattn/sqlite3`). Always `defer db.Close()` only on app exit; the pool is meant to be long-lived.

5h ago 0

Go

slices package — Modern Helpers

`slices` (Go 1.21+) ships the iteration helpers everyone wrote by hand for years: Contains, Index, Sort, SortFunc, BinarySearch, Clone, Reverse, Equal, Max/Min.

5h ago 0

Kotlin

let — Transform or Null-Safe Scope

`x.let { it.foo }` runs the block with `x` as `it` and returns the block's last expression. Combined with `?.`, it's the canonical "do this only if non-null" pattern.

5h ago 0

Java

Jackson — Basic ObjectMapper

`com.fasterxml.jackson.databind.ObjectMapper` is the JSON standard for Java. Construct once (it's expensive + thread-safe) and reuse for every serialization in your app.

5h ago 0

HTML

Code Markup — pre, code, kbd, samp, var

HTML has five semantic elements for technical text: `<code>` (source code), `<pre>` (preserve whitespace), `<kbd>` (keyboard input), `<samp>` (sample output), `<var>` (math/program variable). Each has a different meaning to screen readers and search engines.

5h ago 0

PHP

Simple cURL GET with Timeout

A no-dependency HTTP GET helper with sensible defaults: short timeout, follow redirects, return body as string, throw on transport error. Pass extra headers as a simple associative array.

5h ago 0

PHP

Validate Credit Card (Luhn check)

Apply the Luhn checksum algorithm to a credit card number. Strips spaces/dashes first. This validates the format — not whether the card actually exists or has funds.

5h ago 0

TypeScript

clamp / lerp / mapRange

Three numeric utilities you reach for constantly in animation, UI math, and audio code. Generic enough to use anywhere, no Math.* dance required.

5h ago 0

HTML

Modern Meta Tags (viewport, theme-color, etc.)

The non-obvious meta tags that improve mobile rendering, status-bar coloring, and dark-mode behavior in 2025 browsers. Copy this block whole.

5h ago 0

TypeScript

Debounce (typed)

Wait until the caller stops invoking for `delay` ms, then call the function with the most recent arguments. The TS version preserves the original signature so the returned function has the same parameters.

5h ago 0

Bash

Unique While Preserving Order

`sort -u` re-orders. `awk '!seen[$0]++'` is the classic order-preserving dedupe — and it's a single line.

5h ago 0

Go

log/slog — Structured Logging

`log/slog` (Go 1.21+) is the standard structured logger. Drop-in replacement for `log` with key/value attributes and JSON output for log-pipeline ingestion.

5h ago 0

HTML

Loading State with aria-busy

`aria-busy="true"` tells assistive tech "this section is updating — wait until it's done before re-reading." Combine with a visual spinner and an `aria-live` status message for the best experience.

5h ago 0

Go

Test Helpers with t.Helper()

When you extract a verification routine into a helper, call `t.Helper()` so failure messages point to the CALLER line — not the helper line. One line, much better diagnostics.

5h ago 0

Kotlin

when Expressions — Powerful switch

Kotlin's `when` is an expression (returns a value), supports ranges, type checks, multiple values per branch, and arbitrary boolean conditions. Replaces nested if/else AND traditional switch.

5h ago 0

PHP

Validate Password Strength

Score a password 0–4 (NIST-inspired, not the full zxcvbn algorithm). Encourages length over complexity; flags well-known weak patterns. Use as a UI hint, not a hard barrier.

5h ago 0

TypeScript

Sleep / Delay

The async/await-friendly version of `setTimeout`. The one-liner everyone re-invents — keep it in a util file. Optional AbortSignal lets you cancel mid-wait.

5h ago 0

Python

Deprecation Warning Decorator

Mark a function as deprecated so callers get a DeprecationWarning the first time it's called. Includes the replacement function name in the message so callers know what to switch to.

5h ago 0