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41 nuggets found
Hooking Business Logic with AL Event Subscribers (Premium)
Event subscribers are how you react to platform actions without touching base code. Subscribe to a published event — like validating a field — and run your own logic when...
codeunit 50100 "Loyalty Events"
{
[EventSubscriber(ObjectType::Table, Database::"Sales Header",
'OnAfterValidateEvent', 'Sell-to Customer No.', true, true)]
local procedure OnValidateCustomer(var Rec: Record "Sales Header")
var
Cust: Record Customer;
begin
if...Immutable Value Objects with readonly Properties (Premium)
PHP 8.1 introduced readonly properties. Combined with constructor promotion, they let you build small value objects that cannot be mutated after creation — fewer bugs, clearer intent.
final class GeoPoint
{
public function __construct(
public readonly float $lat,
public readonly float $lng,
) {}
public function distanceTo(GeoPoint $other): float
{
$r = 6371; // km
$dLat = deg2rad($other->lat - $this->lat);
$dLng = deg2rad($...Transforming Arrays with map, filter and reduce (Premium)
Loops that build up a result variable are easy to get wrong. PHP's array functions let you describe what you want — transform, keep, or fold — in a single...
$orders = [
['item' => 'Pen', 'qty' => 3, 'price' => 50],
['item' => 'Book', 'qty' => 1, 'price' => 400],
['item' => 'Marker', 'qty' => 5, 'price' => 80],
];
// Only orders worth 200+, as "item: total"
$lines = array_map(
fn ($o) => "{$o['item']}: " . ($o['qty'] * $o['price']),...Concise Models with Records and Pattern Matching (Premium)
C# records give you immutable data types with value equality in one line. Pair them with switch expressions and pattern matching for branching that stays flat and readable.
public record Shape;
public record Circle(double Radius) : Shape;
public record Rectangle(double Width, double Height) : Shape;
static double Area(Shape shape) => shape switch
{
Circle c => Math.PI * c.Radius * c.Radius,
Rectangle r => r.Width * r.Height,
_...A Tiny HTTP API with ASP.NET Minimal APIs (Premium)
You do not need controllers and a pile of ceremony to expose an endpoint. Minimal APIs let you map routes to lambdas, wire up dependency injection, and return JSON in...
var builder = WebApplication.CreateBuilder(args);
builder.Services.AddSingleton<IPatientStore, PatientStore>();
var app = builder.Build();
app.MapGet("/patients", (IPatientStore store) => Results.Ok(store.All()));
app.MapGet("/patients/{id:int}", (int id, IPatientStore store) =>
store.Find(id)...Composable Request Handling with Express Middleware (Premium)
Express middleware are just functions that run in order on every request. Chain them to add logging, authentication and error handling without repeating yourself in each route.
const express = require("express");
const app = express();
// Simple request logger
app.use((req, res, next) => {
console.log(`${req.method} ${req.url}`);
next();
});
// Reusable auth guard
function requireAuth(req, res, next) {
if (!req.headers.authorization) return res.status(401).json({ e...Processing Large Files with Node.js Streams (Premium)
Reading a whole file into a Buffer does not scale. Streams process data piece by piece and can be piped together, so you can transform gigabytes with a tiny, constant...
const fs = require("fs");
const zlib = require("zlib");
const { pipeline } = require("stream/promises");
const { Transform } = require("stream");
// Uppercase each chunk as it flows through
const upper = new Transform({
transform(chunk, _enc, cb) {
cb(null, chunk.toString().toUpperCase());...Keeping Controllers Skinny with Service Objects (Premium)
When a controller action does five things, it becomes hard to test and reuse. A service object captures one business operation in a single, callable class you can test in...
# app/services/register_patient.rb
class RegisterPatient
def self.call(**args) = new(**args).call
def initialize(name:, email:)
@name = name
@email = email
end
def call
patient = Patient.create!(name: @name, email: @email)
WelcomeMailer.with(patient: patient).greeting.deliv...Readable Queries with ActiveRecord Scopes (Premium)
ActiveRecord scopes name your common queries so they read like intent, not SQL. They are chainable, composable, and keep filtering logic on the model where it belongs.
class Appointment < ApplicationRecord
scope :upcoming, -> { where("starts_at > ?", Time.current) }
scope :for_doctor, ->(doctor) { where(doctor: doctor) }
scope :confirmed, -> { where(status: :confirmed) }
# Combine scopes into a higher-level one
scope :doctor_agenda, ->(doctor) { upcomi...