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
Local Functions
Functions can be declared inside other functions. Closures over outer scope let you eliminate parameter-threading. Use sparingly — too many nested locals hurts readability.
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Kotlin
inline Functions — Zero-Cost Lambdas
`inline fun` copies the body (including lambda bodies) into the call site at compile time. Result: no `Function` object allocated for the lambda; `return` from inside the lambda exits the enclosing function.
Kotlin
Extension Properties
Like extension functions, but as a property. Must have a custom getter (and optionally a setter) since extensions can't have backing fields. Reads like a real property at the call site.
Kotlin
apply — Configure Object, Return Itself
`x.apply { ... }` runs the block with `x` as `this` (so you call methods/set properties directly) and returns `x`. The canonical builder-style configuration.
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.
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.
HTML
Comment / Review Markup with Schema
Comments and reviews can also have Schema.org markup. The `Review` type appears under products in Google search results with star ratings; `Comment` is for general user feedback.
HTML
Native <dialog> Modal
The HTML `<dialog>` element gives you a real modal — focus trap, Escape-to-close, backdrop overlay — without any JS library. Method `.showModal()` opens; `.close()` closes.
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.
Rust
tokio mpsc Channel
Async multi-producer / single-consumer channel. Producers `.send()`, the single receiver `.recv().await` items as they arrive. Bounded — the channel back-pressures producers when full.
TypeScript
Format Duration in ms
Render a number of milliseconds as a human-friendly duration: "1h 23m 45s". Skips leading-zero units automatically so short durations are concise.
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.
PHP
Normalize Phone Number to E.164
A minimal E.164 normalizer for US/CA numbers — strips formatting, prepends "+1" if missing, and validates the digit count. For full international support, reach for giggsey/libphonenumber-for-php.
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.
PHP
Word Count (UTF-8 aware)
Count words in a string in a way that works for any Unicode script — including those without ASCII whitespace. Built on the \p{L}\p{N} Unicode regex categories.
Kotlin
Custom Exception + Sealed Result Pattern
For library / service code, define your own exception hierarchy. Pair with `sealed` + `when` for type-safe error handling at the call site.
Kotlin
Result Type — Safe Error-Returning APIs
`Result<T>` wraps "success or thrown exception" without forcing the caller into try/catch. `runCatching { ... }` is the standard producer.