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
Ktor Server — Middleware (Plugins)
Plugins wrap every request — logging, CORS, auth, rate limiting. Install with `install(Plugin) { config }` at the application level.
@admin
PHP
Verify a JWT (HS256)
Pair to jwtSign: verify the signature, check the exp claim, and return the decoded payload — or null on any failure. Uses hash_equals for constant-time signature comparison.
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.
Kotlin
Ktor Client — GET Request
Ktor is JetBrains' Kotlin-first HTTP client. Multiplatform (JVM, JS, Native). Coroutine-native — every call is a suspend function.
PHP
Atomic File Write
Write a file in a way that other processes never see a half-written state. Write to a temp file in the same directory, then rename — rename is atomic on POSIX filesystems.
Kotlin
repeat, also lateinit and isInitialized
`repeat(n) { i -> ... }` for N-times loops where you don't care about index naming. `lateinit var` lets you declare a non-null var without initializing it — common for DI / framework injection.
Kotlin
async / await for Parallel Results
`async` returns a `Deferred<T>` — like a Future. Use it when you need a RESULT back, in parallel. Call `.await()` to get the value (suspends until ready).
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.
Bash
Multipart File Upload via cURL
Upload one or more files using -F. Optional extra form fields go through the same flag — quote carefully to preserve spaces.
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.
TypeScript
Date Range Generator
Yield each day (or step) between two dates as a Date object. Generator-based so consumers can `break` early without computing the whole range.
PHP
TOTP Code Generate + Verify
Generate and verify a 6-digit time-based one-time password (RFC 6238) compatible with Google Authenticator / Authy. Uses a base32-encoded secret and 30-second time steps.
Rust
axum — Hello World HTTP Server
axum is the tokio-team's web framework — composable, type-safe handlers built on tower middleware. The hello-world is small enough to read in one screen.
Java
Virtual Threads (Java 21+)
Java 21's virtual threads are millions-of-them cheap — JVM multiplexes them onto a small carrier pool. Replaces async/reactive code for most I/O-bound workloads: just write blocking code that doesn't actually block a kernel thread.
Rust
unsafe — When and How
Most Rust is safe. `unsafe` only lets you do 5 things the compiler can't check (raw pointer deref, mutable static, unsafe fn / trait, FFI, union access). Wrap unsafe operations in safe abstractions.
SQL
date_trunc — Bucket Times into Hours/Days/Weeks
`date_trunc('day', ts)` rounds a timestamp down to the start of the day. Use for time-series GROUP BYs — daily/weekly/hourly buckets without messy arithmetic.
Rust
axum with Shared State + Extractors
Use `State` to inject shared application state (DB pool, config, etc.) into every handler. `Path` and `Json` extractors deserialize URL params and request bodies for you.