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
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.
@admin
SQL
WITH Clause — Common Table Expressions
Name a subquery so you can refer to it like a table. Improves readability for complex multi-stage queries — and lets you reuse the same logical block multiple times.
PHP
Safe JSON Decode (no exceptions)
Wrap json_decode so invalid input gives you a clear false rather than a silent null. PHP 7.3+ JSON_THROW_ON_ERROR makes this cleaner — but the wrapper preserves a simple bool API.
Python
Word-Safe Truncate
Cap a string at `max_len` chars without splitting a word; append an ellipsis when truncated. Backs off to the last space if cutting mid-word would happen.
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.
Kotlin
kotlinx.serialization — JSON Basics
Compile-time code generation for JSON serialization. Annotate `@Serializable` on a data class; `Json.encodeToString` and `Json.decodeFromString` are typed.
Go
Crypto-Random Bytes + Hex/Base64
`crypto/rand` is the cryptographic CSPRNG. Use it for tokens, session IDs, API keys, password salts — anywhere `math/rand` would be a security bug.
PHP
Email Address Obfuscator
Render an email address as HTML that is human-readable but resistant to naive scraping bots. Uses entity encoding and an optional Caesar-style ROT for the mailto link.
Java
Wildcards — extends vs super (PECS)
Producer-Extends, Consumer-Super. `? extends T` is read-only (you can take items OUT). `? super T` is write-only (you can put items IN). Lets generic APIs accept a wider range of types.
Kotlin
OkHttp Client (Java interop)
OkHttp is the JVM-standard HTTP library. Works fine from Kotlin; use the `await()` extension from `okhttp3.coroutines` to get suspend support.
Bash
Hash File (SHA-256)
Compute and verify file checksums for downloads, backups, and integrity audits. sha256sum on Linux; shasum -a 256 on macOS.
JavaScript
Download File from Client
Programmatically triggers a file download from a Blob, File object, or plain text/JSON string without a server round-trip. Creates a temporary anchor element with a download attribute and revokes the object URL after use to prevent memory leaks. Supports custom filenames and MIME types.
Java
Text Blocks (Java 15+)
Multi-line string literals with proper indentation handling. Stop concatenating newlines by hand. The compiler removes the common leading whitespace automatically.
JavaScript
Simple State Machine
A lightweight finite state machine that defines valid states and allowed transitions between them. Attempting an invalid transition throws an error. Supports entry/exit hooks per state for side effects. Useful for modelling UI flows (idle → loading → success/error), auth states, and multi-step forms.
PHP
Recursively Delete Directory
Remove a directory and everything under it. Defensive against symlinks (unlinks the symlink rather than recursing into it). Returns the count of items removed.
Bash
Format Date Like a Pro
`date` accepts a format string + optional override of the date being formatted. The +%FT%TZ form gives you ISO-8601 / RFC-3339 in one call.
JavaScript
Format Currency
Formats a number as a locale-aware currency string using the built-in Intl.NumberFormat API. Supports any ISO 4217 currency code and any BCP 47 locale tag. No external library required — handles symbol placement, thousands separators, and decimal places automatically per locale rules.