PHP

Find Open TCP Port

Probe whether a remote host:port accepts connections, with a configurable timeout. Useful for quick health checks in deploy scripts.

16m ago 0

Bash

Most-Modified Files in Repo

Find the hottest files in a git history — useful for spotting hotspots that need refactoring or extra test coverage.

16m ago 0

SQL

Transactions and Isolation Levels

Wrap related changes in a transaction so they commit or roll back together. Isolation levels trade consistency for concurrency — pick the weakest one that meets your correctness needs.

16m ago 0

Kotlin

MockK — Kotlin-Idiomatic Mocking

MockK plays well with Kotlin: final classes, coroutines, top-level functions, all mockable. `every { ... } returns ...` is the canonical setup.

16m ago 0

Bash

cURL GET with Timeout + Retry

A sensible default cURL invocation: short connect timeout, total timeout, retry on transient failures with backoff, fail-on-error.

16m 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.

16m ago 0

Rust

Parse Strings to Typed Values

`str::parse::<T>()` works for every type that implements `FromStr` — every numeric type, `bool`, `IpAddr`, `Uuid` (with the crate), etc. Returns `Result` so you can chain with `?`.

18m ago 0

TypeScript

useFetch — Minimal Data Fetching Hook

A tiny self-contained data-fetching hook with loading/error/data states and AbortController cleanup on unmount. Good baseline before reaching for TanStack Query.

18m ago 0

Go

rate.Limiter — Token-Bucket Rate Limiting

`golang.org/x/time/rate` provides a battle-tested token-bucket limiter. Use to enforce "N requests per second with bursts up to B" — for per-IP throttling, external API rate limits, etc.

18m ago 0

SQL

GROUP BY — Aggregation Basics

`GROUP BY` collapses rows into buckets; the SELECT list must be aggregates OR grouped columns. The most common reporting pattern in SQL.

18m ago 0

HTML

Visually Hidden Utility (.sr-only)

Hides content from sighted users but keeps it discoverable by screen readers. Use for icon-only buttons, table-row context, and form-status announcements that don't need visible text.

18m ago 0

HTML

Product Page with Schema.org Markup

Marking up a product page with the Schema.org `Product` type unlocks Google's rich snippets — price, rating, availability appear directly in search results. JSON-LD is the recommended format.

18m ago 0

TypeScript

const Assertions for Literal Types

`as const` freezes a value as deeply readonly and infers the narrowest possible literal types. Replaces enums for most use cases — better tree-shaking, no runtime cost.

18m ago 0

Kotlin

ViewModel + StateFlow + Compose

Standard Android pattern: ViewModel holds state in a `StateFlow`, Compose collects it as state. Survives config changes; isolates business logic from UI.

18m ago 0

Kotlin

groupBy and partition

`groupBy` returns a `Map<Key, List<T>>` keyed by what the lambda returns. `partition` is a special-case `groupBy` for booleans — returns `(matching, nonMatching)` Pair.

18m ago 0

Bash

Rotate Logs Manually

If a service doesn't hook into logrotate, you can still rotate a log file yourself in one safe pattern: rename current → .1, truncate the original, signal the process to re-open if needed.

18m ago 0

Bash

Squash Last N Commits

Combine the last N commits into one before merging a feature branch. Avoids hours of "WIP" / "fix typo" commits cluttering history.

18m ago 0

TypeScript

Conditional Types Basics

`T extends U ? X : Y` lets types branch on shape. Combine with `infer` to extract pieces of complex types — the building block under `ReturnType`, `Parameters`, and most utility libraries.

18m ago 0

Kotlin

Enums with Properties and Methods

Kotlin enums can carry constructor properties and define methods — including abstract methods overridden per constant. Way more expressive than Java enums.

18m ago 0

Java

Sorting with Comparator

`Comparator.comparing`, `thenComparing`, and `reversed()` chain into expressive multi-field sorts. Way cleaner than the old Comparable spaghetti.

18m ago 0

Kotlin

Parameterized Tests with JUnit 5

JUnit 5 + Kotlin: `@ParameterizedTest` runs the same test body with multiple input rows. `@CsvSource` for inline data, `@MethodSource` for complex args.

18m ago 0

SQL

Foreign Keys + ON DELETE Behavior

A foreign key prevents orphan rows. The `ON DELETE` clause decides what happens to children when the parent goes away: `CASCADE`, `SET NULL`, `RESTRICT`, `NO ACTION`.

18m ago 0

HTML

Main Content + Aside Sidebar

`<main>` wraps the unique-to-this-page content (screen readers jump to it with a keyboard shortcut). `<aside>` is supporting / tangential content — sidebars, callouts, related links.

18m ago 0

PHP

Minimal PSR-3 Logger

A 30-line PSR-3 compatible logger you can drop into any project that expects \Psr\Log\LoggerInterface. Writes to a file using the JSON structured format.

18m ago 0

TypeScript

Mapped Types (Partial/Required/etc)

Mapped types iterate over keys to produce new types. The standard library's `Partial`, `Required`, `Readonly`, `Pick`, `Omit`, `Record` are all one-liners — and you can build your own.

18m ago 0

TypeScript

Result / Either Type

Encode "this might fail" in the type signature instead of throwing. Force the caller to handle both branches at compile time. Better than try/catch for foreseeable failures.

18m ago 0

HTML

Tabs (ARIA tablist pattern)

The accessible tab pattern: a `role="tablist"` container, each tab as `role="tab"`, panels as `role="tabpanel"`. `aria-selected` + `aria-controls` link them and announce state.

18m ago 0

Python

Timing Decorator with Logger

Drop @timed on any function and get its wall-clock duration logged on every call. Uses functools.wraps so introspection (name, docstring, signature) still works.

18m ago 0

Kotlin

Compose LaunchedEffect — Side Effects

`LaunchedEffect(key)` runs a coroutine when the key changes. Use for one-shot init, snapshot listening, data loading, or any suspend work tied to a composition.

18m ago 0

Kotlin

use { } — Auto-Close Resources

`use { }` calls `close()` on any `Closeable` (file, stream, JDBC connection, …) when the block exits — even on exception. Kotlin's try-with-resources.

18m ago 0