Intermediate code explainers

java

@Configuration
@EnableIntegration
public class OrderProcessingFlow {

Building an order pipeline with Spring Integration

messaging pipeline enterprise integration patterns

Intermediate 9 steps

go

package token
 
import (
	"crypto/rand"

Generating secure random tokens in Go

cryptography randomness encoding

Intermediate 5 steps

typescript

import { z } from "zod";
 
const DatabaseSchema = z.object({
  host: z.string().min(1),

Validating config with Zod schemas

schema-validation runtime-safety type-inference

Intermediate 8 steps

php

function deepMerge(array $defaults, array $overrides): array
{
    foreach ($overrides as $key => $value) {
        if (

Recursively merging nested config arrays in PHP

recursion arrays configuration

Intermediate 6 steps

javascript

import { NextResponse } from 'next/server';
import { jwtVerify } from 'jose';
 
const PROTECTED_PREFIXES = ['/dashboard', '/settings', '/billing'];

Gating routes with Next.js middleware and JWTs

authentication middleware jwt

Intermediate 8 steps

python

from functools import wraps
from flask import Blueprint, session, request, redirect, url_for, flash, render_template
from werkzeug.security import check_password_hash

Session-based auth with a Flask Blueprint

authentication decorators sessions

Intermediate 9 steps

java

public OrderConfirmation submitOrder(Order order) throws IOException, InterruptedException {
    String payload = objectMapper.writeValueAsString(order);
 
    HttpRequest request = HttpRequest.newBuilder()

Posting an order with Java's HttpClient

http-client json-serialization error-handling

Intermediate 6 steps

go

package middleware
 
import (
	"bytes"

Capturing response bodies in Gin middleware

middleware response-capture struct-embedding

Intermediate 7 steps

rust

use serde::{Deserialize, Serialize};
 
#[derive(Debug, Serialize, Deserialize)]
#[serde(tag = "type", rename_all = "snake_case")]

Tagged enums with serde in Rust

enums serialization json

Intermediate 6 steps

ruby

class DurationParser
  UNIT_SECONDS = {
    'w' => 604_800,
    'd' => 86_400,

Parsing duration strings into seconds in Ruby

parsing regular-expressions validation

Intermediate 7 steps

typescript

import { inject } from '@angular/core';
import {
  ActivatedRouteSnapshot,
  CanActivateFn,

How a functional route guard works in Angular

route-guards dependency-injection rxjs

Intermediate 5 steps

php

<?php
 
namespace App\Models;

Making an Eloquent model searchable with Scout in Laravel

full-text-search indexing eloquent

Intermediate 8 steps

javascript

const express = require('express');
const session = require('express-session');
const RedisStore = require('connect-redis').default;
const { createClient } = require('redis');

Redis-backed session auth in Express

sessions authentication redis

Intermediate 8 steps

python

import logging
import re

Redacting secrets in Python log records

logging regex redaction

Intermediate 7 steps

java

package com.acme.billing.config;
 
import org.flywaydb.core.Flyway;
import org.flywaydb.core.api.MigrationVersion;

Customizing Flyway migrations in Spring

database-migrations flyway dependency-injection

Intermediate 6 steps

go

func GetArticle(c *gin.Context) {
	id := c.Param("id")
 
	article, err := articleRepo.FindByID(c.Request.Context(), id)

Conditional GET with ETags in Gin

http-caching etag conditional-requests

Intermediate 7 steps

go

package middleware
 
import (
	"net/http"

How a www-to-apex redirect middleware works in Gin

middleware http-redirect closures

Intermediate 5 steps

typescript

type SortDirection = "asc" | "desc";
 
interface SortKey<T> {
  selector: (row: T) => string | number | Date | null | undefined;

Multi-column sorting in TypeScript

generics comparators sorting

Intermediate 6 steps