Tags
#php
#kotlin
#bash
#go
#sql
#rust
#typescript
#html
#java
#python
#files
#utils
#strings
#http
#concurrency
#async
#json
#arrays
#security
#types
#crypto
#database
#dates
#format
Kotlin
val vs var — Prefer Immutability
`val` is read-only (can't reassign the reference); `var` is mutable. Default to `val` everywhere — Kotlin's style guide recommends it, and a Compiler warning fires if a `var` is never reassigned.
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HTML
JSON-LD Structured Data (Schema.org)
JSON-LD is Google's preferred way to mark up structured data for rich search results. Drop it in a <script type="application/ld+json"> tag in <head>. Validate with Google's Rich Results Test.
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.
HTML
Audio Element
`<audio>` is video's simpler sibling. Use it for podcasts, music samples, sound effects on play. Same multi-`<source>` pattern for cross-browser format support.
PHP
Simple File-Backed Cache
A tiny key-value cache with TTL, persisted as a serialized PHP file per key. Good enough for memoizing expensive computations on a single machine; replace with Redis when scaling out.
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.
Go
struct Tags for JSON Marshaling
Backtick string tags on struct fields control how `encoding/json` serializes them — rename to camelCase, omit zero values, skip entirely. The same tag system is used by many other libraries.
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.
Python
ThreadPoolExecutor for I/O-Bound Work
Parallelize I/O-bound tasks (HTTP requests, file reads, DB queries) without writing thread management code. The default thread count is min(32, os.cpu_count() + 4) — usually the right call.
Rust
tracing — Structured Logging Setup
`tracing` is the structured-logging story for async Rust — better than `log` for anything tokio-based. Drop in this initializer and use `info!`, `warn!`, `error!` macros throughout.
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.
Python
Retry Decorator with Exponential Backoff
Generic retry decorator: attempts × base delay, exponential ramp, random jitter. Filter retryable exceptions via the `on` tuple so logical errors aren't retried.
Go
UUID Generation (google/uuid)
`github.com/google/uuid` is the standard UUID library. v4 (random) for IDs, v7 (time-ordered) when you want UUIDs that sort chronologically and play nicely with B-tree indexes.
Rust
match with Guards, Ranges, and Bindings
`match` arms can have `if` guards, range patterns (`1..=5`), bindings (`x @ pattern`), and ORs (`A | B`). Combine them for very expressive dispatch.
SQL
INSERT … SELECT — Bulk Copy
Copy/transform rows from a SELECT into another table — the cheapest way to move data within the database. Skip column lists at your peril; positional matching is fragile.
PHP
Compound Interest Calculator
Compute the future value of an investment compounded n times per year for t years. Returns both the final value and the interest earned.
JavaScript
Calculate Reading Time
Estimates the reading time of a block of text based on an average adult reading speed (default 200 words per minute). Strips HTML tags before counting to handle rich-text content. Returns the result in minutes, rounded up, so a short article always shows at least "1 min read".