#factory-method code explainers

php

<?php
 
namespace App\Http\Requests;

A validated date-range value object in PHP

value-object validation immutability

Intermediate 7 steps

java

public record FixedWidthField(String name, int start, int end) {
 
    public String extract(String line) {
        int from = Math.min(start, line.length());

Parsing fixed-width text in Java

records parsing streams

Intermediate 7 steps

java

public final class QueryParams {
 
    private final Map<String, List<String>> params;

Parsing and building URL query strings in Java

parsing multimap url-encoding

Intermediate 9 steps

java

public record ServerConfig(String host, int port, boolean tls, List<String> allowedOrigins) {
 
    public ServerConfig {
        Objects.requireNonNull(host, "host is required");

Validating config with a Java record

records validation immutability

Intermediate 9 steps