Intermediate code explainers

php

namespace App\Http\Filters;
 
use Closure;
use Illuminate\Database\Eloquent\Builder;

Composable query filters with Laravel's Pipeline

pipeline query-builder single-responsibility

Intermediate 7 steps

go

package render
 
import (
	"net/http"

How Gin renders MsgPack responses

serialization content-type interface-implementation

Intermediate 5 steps

typescript

import {
  Controller,
  Get,
  Query,

Validating paginated queries in NestJS

pagination validation pipes

Intermediate 7 steps

rust

use axum::{
    body::{Body, Bytes},
    extract::Request,
    http::StatusCode,

Logging request bodies in Axum middleware

middleware streaming-body logging

Intermediate 8 steps

java

import java.util.Comparator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.regex.Pattern;

Ranking the most frequent words in Java

streams regex grouping

Intermediate 7 steps

ruby

class Booking < ApplicationRecord
  belongs_to :room
  belongs_to :guest

Guarding booking dates in a Rails model

validations associations scopes

Intermediate 5 steps

python

import pytest
from fastapi.testclient import TestClient
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker

Testing FastAPI routes with dependency overrides

testing fixtures dependency-injection

Intermediate 7 steps

javascript

import { createContext, useContext, useState, useId } from "react";
 
const AccordionContext = createContext(null);
const ItemContext = createContext(null);

Building a compound Accordion in React

context compound-components state-management

Intermediate 8 steps

php

namespace App\Providers;
 
use Illuminate\Database\Query\Builder as QueryBuilder;
use Illuminate\Database\Eloquent\Builder as EloquentBuilder;

Adding a whereActive macro in Laravel

macros service-provider query-builder

Intermediate 5 steps

go

package proxy
 
import (
	"log"

Building a hardened Go reverse proxy

reverse-proxy http timeouts

Intermediate 7 steps

rust

use std::time::Duration;
 
use axum::{
    body::Body,

Turning Axum timeouts into 504 JSON

middleware timeouts error-handling

Intermediate 7 steps

java

public final class HttpHeaders {
 
    private final NavigableMap<String, List<String>> values =
            new TreeMap<>(String.CASE_INSENSITIVE_ORDER);

A case-insensitive HTTP headers map in Java

case-insensitivity multimap immutability

Intermediate 7 steps

ruby

class DashboardMetrics
  CACHE_TTL = 15.minutes
 
  def initialize(account)

Caching dashboard metrics in Rails

caching service-object query-optimization

Intermediate 5 steps

python

import hashlib
import os
from datetime import timedelta

Serving cacheable static assets in Flask

http-caching etag conditional-requests

Intermediate 8 steps

php

<?php
 
namespace App\Reminders;

Scheduling reminders across time zones in PHP

timezones datetime immutability

Intermediate 7 steps

go

package middleware
 
import (
	"net/http"

A per-IP rate limiter middleware in Gin

rate-limiting token-bucket middleware

Intermediate 8 steps

typescript

import {
  Controller,
  Post,
  UploadedFile,

Handling avatar uploads in NestJS

file-upload validation interceptors

Intermediate 7 steps

java

public record ServerConfig(
        String host,
        int port,
        Duration timeout,

Loading typed config into a Java record

records factory-methods parsing

Intermediate 7 steps