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
Rust
Option Combinators (no unwrap!)
`Option<T>` has a rich combinator API that lets you avoid both `unwrap()` and the verbose `match`. Chain `map`, `and_then`, `unwrap_or`, `or_else` to compose fallible operations.
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Python
Mask Sensitive Strings (PII)
Mask the middle of a string while keeping a few chars at each end. Useful for displaying credit cards, emails, or API keys in UI / logs without leaking the whole value.
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.
PHP
Number to Ordinal (1st, 2nd, 3rd)
Convert an integer to its English ordinal form ("1st", "2nd", "3rd", "11th", "22nd", "103rd"). Pure rule-based; no library needed.
PHP
PDO Connection with Sensible Defaults
Open a PDO connection with all the options you almost always want: real prepared statements, exceptions on error, associative-array fetch mode, UTF-8 charset.
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.
PHP
Pluck Column From Array of Rows
Extract a single column from a list of associative arrays into a flat list. Common transformation for SELECT results — equivalent to array_column with optional indexing key.
Kotlin
kotlinx-datetime — Multiplatform Dates
`kotlinx-datetime` is the multiplatform date/time library — works on JVM, JS, Native. `Instant` (UTC moment), `LocalDate`, `TimeZone` are the building blocks.
HTML
Radio Group with Fieldset + Legend
Always wrap radio groups (and checkboxes that share semantics) in a `<fieldset>` with a `<legend>`. Screen readers announce the legend before each option — without it, the choice is contextless.
Java
java.time — Format and Parse
`DateTimeFormatter` replaces `SimpleDateFormat` (which was not thread-safe). Constants for the common formats; pattern strings for custom layouts.
PHP
Convert Timestamp to User Timezone
Convert a stored UTC timestamp into the viewer's timezone for display. Round-trip safe: re-converting to UTC always gives back the original timestamp.
JavaScript
Format Relative Time
Returns a human-readable relative time string ("3 days ago", "in 2 hours") using the Intl.RelativeTimeFormat API. Automatically selects the most appropriate unit (seconds, minutes, hours, days, weeks, months, years) based on the elapsed time. Fully localised — pass any BCP 47 locale.
JavaScript
Copy Text to Clipboard
Copies a string to the system clipboard. Uses the modern navigator.clipboard.writeText API (requires HTTPS or localhost) and falls back to the deprecated document.execCommand approach for older browsers or non-secure contexts. Returns a Promise so you can show success/error feedback.
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.
JavaScript
Unique Array Values
Returns a new array with duplicate values removed. The fast version uses a Set for primitives. The deep version supports deduplicating objects by a specific key, making it suitable for deduplicating API results or merged data sets.
SQL
JSONB Columns (PostgreSQL)
`jsonb` stores binary-optimized JSON. Index sub-fields with GIN for fast containment queries. Most-used operators: `->` (get field), `->>` (get as text), `@>` (contains), `?` (key exists).
Java
HttpClient — Synchronous GET (Java 11+)
`java.net.http.HttpClient` ships in the JDK — no Apache HttpClient or OkHttp needed for most cases. Reuse one client across the app; configure timeouts and follow-redirects up front.