HTML

Form Validation Attributes

Built-in client-side validation: `required`, `pattern`, `minlength`/`maxlength`, `min`/`max`. The browser blocks submission and shows a native error if anything fails. Always validate on the server too.

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Kotlin

Ktor Server — Hello World

Ktor lets you stand up an HTTP server in a few lines. Pick an engine (Netty / Jetty / CIO), declare routes, run. Coroutine-native end to end.

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PHP

Date Range Iterator

Yield each date in a [start, end] interval as a DateTimeImmutable, with a configurable step. Builds on DatePeriod under the hood — but exposes a generator so you can break out early.

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PHP

JSON Lines (NDJSON) Stream Reader

Read newline-delimited JSON (one object per line) as a generator. Each yield gives you the next decoded record without holding the whole file in memory.

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PHP

Set Nested Value by Dot Path

Mutate a nested array by dot path, auto-creating any intermediate arrays. Companion to getPath; together they replace a lot of isset+array_key_exists ladders.

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Bash

URL-Encode and URL-Decode

Encode and decode URL-safe strings entirely in bash — no python or external tool required. Useful in pure-shell deployment scripts that need to build query strings.

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Rust

Async Timeout

Wrap any future in `tokio::time::timeout` to fail it if it takes too long. Returns `Err(Elapsed)` on timeout; you decide what to do next (retry, fall back, propagate).

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Rust

Rayon — Parallel Iterators

`rayon` lets you parallelize CPU-bound iterator chains by changing `.iter()` to `.par_iter()`. Handles thread-pool, work-stealing, and synchronization for you.

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SQL

Self-Join — Org Chart / Hierarchies

A self-join is just a regular join with the same table aliased twice. The canonical example is an employee table where each row points to a manager in the same table.

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SQL

EXTRACT — Pull Parts Out of a Timestamp

`EXTRACT(field FROM timestamp)` pulls year, month, hour, day-of-week, week, epoch — whatever you need to group, filter, or render. Standard SQL across every database.

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HTML

Pricing Plan Card

Single-tier pricing card with plan name, price, feature list, CTA. Replicate three times for a standard pricing page; highlight the "recommended" tier with a different border color.

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Kotlin

Extension Functions

Add methods to ANY type — including stdlib types like String, List, or Int — without subclassing. Compiled as a static dispatched function, so no runtime overhead.

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PHP

Validate UUID (any version)

Match the canonical 8-4-4-4-12 hex format, optionally pinning to a specific UUID version (1-5). Case-insensitive.

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PHP

Rate Limiter (token bucket, file-backed)

A dirt-simple rate limiter that throttles per-key using a token bucket persisted to a JSON file. Good for single-server protection of expensive endpoints; reach for Redis when you scale out.

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TypeScript

Promise.allSettled — Typed Results

`Promise.all` rejects on the first failure; `allSettled` waits for every promise and gives you per-promise status. Pair with a type guard to split fulfilled from rejected.

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Python

textwrap dedent + fill (Multi-line Strings)

`textwrap.dedent` strips common leading whitespace from a triple-quoted string — finally, you can indent multiline strings inside functions without breaking the formatting. `fill` wraps to a max width.

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Python

logging.basicConfig with Rotating File

A solid logging setup: rich format, rotating file handler so logs don't fill the disk, plus a console handler at a higher level so noisy DEBUG only goes to the file.

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Python

AES-GCM Encrypt / Decrypt (cryptography)

Authenticated symmetric encryption using AES-256-GCM from the `cryptography` package. Stores nonce + ciphertext + tag together as base64 so storage is a single column.

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Go

text/template — Simple Templating

Stdlib templating with `{{.Field}}` placeholders, range loops, if/else, and function pipelines. Safe alternative for non-HTML text (e.g. emails, config files).

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Java

Collectors.partitioningBy — Split by Predicate

Special case of groupingBy when the key is boolean — returns a `Map<Boolean, List<T>>` for the "true" and "false" buckets. Slightly more efficient than groupingBy.

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HTML

Registration Form (new-password + email-verify)

`autocomplete="new-password"` tells password managers to OFFER a generated password instead of filling an existing one. `autocomplete="email"` and `inputmode="email"` give phones the right keyboard.

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Kotlin

Ktor Server — JSON API with kotlinx.serialization

Install `ContentNegotiation` + `Json` plugin and you get typed (de)serialization for every route. Decode request bodies into data classes; respond with data classes.

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JavaScript

LocalStorage with Expiry

Extends localStorage with TTL (time-to-live) support. setItem stores a value alongside an expiry timestamp. getItem returns null and removes the key if the TTL has elapsed. Useful for caching API responses client-side, storing ephemeral UI state, and implementing remember-me tokens without a backend session.

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PHP

Generate Secure API Key

Mint an API key with a recognizable prefix ("sk_live_…") and 32 bytes of crypto-random entropy encoded as URL-safe base64. Stripe-style readable IDs.

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TypeScript

JSON POST Helper

Companion to `http<T>` — POST a JSON body and parse a JSON response, both typed. Handles the boilerplate Content-Type header and JSON serialization.

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Python

Producer / Consumer Queue (threading)

Classic producer / multi-consumer pattern using queue.Queue. Producers put work onto the queue; consumers pull and process; a sentinel value signals shutdown.

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Bash

Slice Bash Array

Bash supports Python-like array slicing via ${arr[@]:offset:length}. Lets you take/skip elements without external tools.

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Bash

Deduplicate Array (preserve order)

Bash's associative arrays let you dedupe in a single pass while keeping the original order — `sort -u` would shuffle.

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Bash

Check If Array Contains Element

A pure-bash membership test using `=~` or by iterating. Both are useful — pick by readability vs. speed.

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Bash

Epoch ↔ Human Date Conversion

`date +%s` gives now-as-epoch; `date -d @N` converts an epoch number back to a human date. Often what API responses expect / return.

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