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go 
package webhooks
 
import (
	"crypto/hmac"

Verifying GitHub webhooks in Gin

hmac webhooks middleware
Intermediate 6 steps
rust 
use std::time::Duration;
 
use axum::{routing::get, Router};
use tokio::net::TcpListener;

Graceful shutdown in an Axum server

graceful-shutdown signal-handling async
Intermediate 8 steps
python 
from django.db import models
from django.utils import timezone
 
 

How soft deletes work in Django

soft-delete querysets managers
Intermediate 10 steps
php 
class PostController extends Controller
{
    public function index(Request $request): AnonymousResourceCollection
    {

Filtered, paginated JSON APIs in Laravel

eloquent query-builder api-resources
Intermediate 8 steps
javascript 
import { useState, useEffect, useMemo } from 'react';
 
function useDebounce(value, delay = 300) {
  const [debounced, setDebounced] = useState(value);

Debounced search with cancellation in React

custom-hooks debounce abortcontroller
Intermediate 9 steps
java 
package com.example.payments.config;
 
import jakarta.validation.constraints.Min;
import jakarta.validation.constraints.NotBlank;

Type-safe config with Spring records

configuration validation records
Intermediate 6 steps
ruby 
module SoftDeletable
  extend ActiveSupport::Concern
 
  included do

How a soft-delete concern works in Rails

concerns soft-delete scopes
Intermediate 8 steps
typescript 
type CloneInput = Record<string, unknown> | unknown[] | Map<unknown, unknown> | Set<unknown>;
 
export function deepClone<T>(value: T): T {
  if (typeof structuredClone === "function") {

Building a deepClone with cycle safety

recursion deep-copy cycle-detection
Intermediate 8 steps
rust 
use std::fs::File;
use std::io::{self, BufRead, BufReader};
use std::path::Path;
 

Buffered log scanning in Rust

buffered-io error-handling streaming
Intermediate 9 steps
python 
from functools import wraps
 
 
def memoize(func):

Building a memoize decorator in Python

decorators closures memoization
Intermediate 5 steps
php 
<?php
 
namespace App\Support;
 

Grouping records with array_reduce in PHP

array-reduce grouping higher-order-functions
Intermediate 6 steps
java 
@Component
public class RequestTimingInterceptor implements HandlerInterceptor {
 
    private static final Logger log = LoggerFactory.getLogger(RequestTimingInterceptor.class);

How a Spring HandlerInterceptor times requests

interceptor request-lifecycle logging
Intermediate 6 steps
ruby 
class Post < ApplicationRecord
  before_validation :generate_slug, on: :create
 
  validates :slug, presence: true, uniqueness: true

How a Rails model builds unique slugs

slugs callbacks validations
Intermediate 7 steps
go 
package middleware
 
import (
	"errors"

Centralized error handling in Gin

middleware error-handling custom-errors
Intermediate 8 steps
typescript 
import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable, shareReplay } from 'rxjs';
 

Caching HTTP config in an Angular service

caching observables dependency-injection
Intermediate 6 steps
rust 
use axum::{
    extract::{Path, State},
    routing::{get, post},
    Json, Router,

Building a nested REST API router in Axum

routing extractors shared-state
Intermediate 8 steps
python 
import os
import tempfile
from pathlib import Path
from typing import Union

How atomic file writes work in Python

atomicity filesystem durability
Advanced 7 steps
php 
<?php
 
namespace App\Console;
 

How task scheduling works in Laravel

scheduling cron fluent-api
Intermediate 7 steps