codesnips
ruby 
class AddressForm
  include ActiveModel::Model
  include ActiveModel::Attributes

  attribute :line1, :string
  attribute :line2, :string

Rails Nested Address Form Object With Aggregated ActiveModel Errors

rails activemodel form-object
by codesnips 3 tabs
javascript 
class TokenBucket {
  constructor(capacity, refillPerSecond) {
    this.capacity = capacity;
    this.refillPerMs = refillPerSecond / 1000;
    this.tokens = capacity;
    this.lastRefill = Date.now();

Token Bucket Rate Limiter Middleware for Express with Per-Key Buckets

nodejs express rate-limiting
by codesnips 4 tabs
typescript 
const RETRYABLE_STATUS = new Set([408, 429, 500, 502, 503, 504]);

export function isRetryable(error: unknown, response?: Response): boolean {
  if (response) {
    return RETRYABLE_STATUS.has(response.status);
  }

Retrying Fetch With Exponential Backoff and Full Jitter in TypeScript

retry backoff jitter
by codesnips 3 tabs
rust 
use base64::{engine::general_purpose::URL_SAFE_NO_PAD, Engine};
use serde::{Deserialize, Serialize};
use time::OffsetDateTime;
use uuid::Uuid;

#[derive(Debug, Clone, Serialize, Deserialize)]

Cursor-Paginated Streaming REST Endpoint in Axum with Keyset Pagination

axum rust pagination
by codesnips 3 tabs
go 
package health

import (
	"context"
	"sync"
	"time"

Concurrent Readiness Health Check Endpoint in Go with Timeouts

go health-check readiness
by codesnips 3 tabs
ruby 
class RegistrationsController < ApplicationController
  def new
    @user = User.new
  end

  def create

Send a Welcome Email After Signup Using a Sidekiq Background Job in Rails

ruby rails sidekiq
by codesnips 4 tabs
go 
package pricecache

import (
	"context"
	"sync"

Collapse Concurrent Identical Requests in Go with singleflight

go singleflight concurrency
by codesnips 3 tabs
python 
import functools
import threading
import time
from collections import OrderedDict

Custom TTL + LRU Cache Decorator for Expensive Python Computations

python caching lru
by codesnips 2 tabs
php 
<?php

namespace App\Exports;

use Illuminate\Database\Eloquent\Builder;
use Illuminate\Support\Carbon;

Streaming a Filtered Orders CSV Export in Laravel with StreamedResponse

php laravel csv
by codesnips 3 tabs
ruby 
module KeysetPaginatable
  extend ActiveSupport::Concern

  class_methods do
    def keyset_page(cursor: nil, limit: 20, direction: :desc)
      limit = limit.to_i.clamp(1, 100)

Keyset Cursor Pagination for ActiveRecord Instead of OFFSET

ruby rails activerecord
by codesnips 4 tabs
rust 
use std::collections::HashMap;
use std::hash::Hash;
use std::sync::{Arc, RwLock};

pub struct Memoizer<K, V> {
    store: RwLock<HashMap<K, Arc<V>>>,

Thread-Safe Memoization in Rust with RwLock and OnceCell Sharding

rust concurrency memoization
by codesnips 3 tabs
javascript 
import { useState, useEffect, useCallback } from 'react';

export function useLocalStorage(key, initialValue) {
  const readValue = useCallback(() => {
    if (typeof window === 'undefined') return initialValue;
    try {

Persist a React Shopping Cart to localStorage with a Context Provider

javascript react context
by codesnips 3 tabs