admin
@admin ADMIN
Member since Apr 2026
770
Public snippets
5
Net score
5
Total upvotes

Showing 31–60 of 770 public snippets

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).
just now 0
Python
chunked — Split Iterable into Fixed-Size Pieces
Lazy chunker that works on any iterable, not just lists. Common building block for batch APIs — "send 50 rows per request" — without loading the source into memory.
just now 0
TypeScript
invariant() — Always-On Assertion
Throw if a condition is false, with TypeScript narrowing the type afterwards. Replaces ad-hoc `if (!x) throw` ladders and gives you type-safe guards in one line.
just now 0
Kotlin
Coroutine Timeout with withTimeout
`withTimeout(ms) { ... }` cancels the inner coroutine if it doesn't finish in time and throws `TimeoutCancellationException`. `withTimeoutOrNull` returns null instead.
just now 0
Bash
Array Basics (index + iterate)
Bash 4+ arrays — declare, access by index, get all elements with [@], length with #. The quoting matters: "${arr[@]}" preserves each element; ${arr[@]} word-splits.
just now 0
PHP
cURL Multipart File Upload
Upload one or more files via multipart/form-data using cURL's CURLFile abstraction. No manual boundary or body construction needed.
just now 0
Kotlin
withContext — Switching Dispatchers
`withContext(dispatcher)` suspends the calling coroutine, runs the block on the given dispatcher, returns the result. Use `Dispatchers.IO` for blocking I/O, `Default` for CPU work, `Main` for UI updates.
just now 0
TypeScript
range — Lazy Number Iterator
A generator-based numeric range: `[start, end)` with an optional step. Lazy so it doesn't allocate a huge array up front; consume with for…of or Array.from.
just now 0
PHP
Recursive Directory Walker
Yield every file under a directory using a generator and SPL's RecursiveIteratorIterator. Filter by extension or any other predicate without slurping all paths into memory first.
just now 0
TypeScript
Sum / Mean / Median (numeric arrays)
The descriptive-stat trio for number[]. Median sorts a copy so the input is left alone. Empty input returns 0 / 0 / 0 rather than NaN — opinionated, but predictable.
just now 0
Go
filepath.Walk — Recursive Tree Walk
`filepath.WalkDir` (Go 1.16+) is the modern, faster version. Visit every file/dir under a root; the callback decides whether to skip or process.
just now 0
PHP
Rotating Log Writer
Append to a single log file but auto-rotate to .1/.2/.3 once the file exceeds a configurable size. No external dependencies — just rename + size check.
just now 0
Bash
URL-Encode and URL-Decode
Encode and decode URL-safe strings entirely in bash — no python or external tool required. Useful in pure-shell deployment scripts that need to build query strings.
just now 0
Kotlin
Channel — Coroutine Communication
A `Channel<T>` is a coroutine-safe queue — producer side sends, consumer side receives. Bounded buffer applies backpressure. Use Flow when broadcasting; use Channel for hand-off between coroutines.
just now 0
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.
just now 0
PHP
CSRF Token Generate + Verify
Per-session CSRF token helpers using hash_equals for constant-time comparison. Token is regenerated on logout but persists across requests within a session.
just now 0
Kotlin
coroutineScope and Structured Concurrency
`coroutineScope { }` waits for ALL its children before returning. If any child throws, the others are cancelled. The cornerstone of structured concurrency — no leaked coroutines.
just now 0
Kotlin
Default Arguments + Named Parameters
Default values eliminate most overload sets. Named args make call sites self-documenting and let you skip middle parameters without thinking about positions.
just now 0
Go
HTTP Middleware (Decorator Pattern)
Middleware in Go is `func(http.Handler) http.Handler`. Wrap a handler with logging, auth, recovery, CORS, or rate limiting — chain them together for a real middleware stack.
just now 0
Kotlin
tailrec — Tail-Call Optimization
Mark a recursive function `tailrec` and the compiler rewrites it as a loop — no stack frame per call, no StackOverflowError on deep recursion. Function must end with itself as the FINAL expression.
just now 0
Kotlin
select — Choose Among Channels
`select { }` lets a coroutine wait on multiple suspending operations and proceed when the first one is ready — like nginx select() but for channels, deferreds, and timers.
just now 0
SQL
Generated / Computed Columns
A column whose value is derived from other columns and maintained automatically. PostgreSQL has STORED (persisted) and MySQL adds VIRTUAL (computed on read). Saves you from triggers for derived data.
1m ago 0
Java
CompletableFuture — Async Chains
`CompletableFuture` is the idiomatic way to compose async work. `thenApply` for sync transforms, `thenCompose` for async chains (flatMap), `exceptionally` for fallback on failure.
1m ago 0
TypeScript
Typed Fetch Wrapper
A thin fetch wrapper that returns parsed JSON typed as `T`, throws on non-2xx, and accepts an AbortSignal. Single source of truth for "how this app talks to APIs."
1m ago 0
TypeScript
clamp / lerp / mapRange
Three numeric utilities you reach for constantly in animation, UI math, and audio code. Generic enough to use anywhere, no Math.* dance required.
1m ago 0
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.
1m ago 0
PHP
Get Nested Value by Dot Path
Read deeply-nested array values like Lodash _.get(). Use a "a.b.c" string instead of nested isset checks; returns a default on any missing segment.
1m ago 0
PHP
Unique by Callback
Like array_unique, but the uniqueness test is a callback that returns the key to dedupe by. Useful for "unique by ID" or "unique by lowercased email" across arrays of objects/rows.
1m ago 0
Bash
Process Substitution Cheatsheet
`<(...)` makes a command's output look like a file; `>(...)` makes a command's input look like a file. Killer feature for tools that only accept filenames.
1m ago 0
Go
Functional Options Pattern
Replace giant config structs with a variadic list of `Option` functions. Lets you add optional parameters later without breaking existing callers. The standard Go API design for constructors.
1m ago 0