Garry Taylor gpltaylor

Dotnet Records was introduced in 2020 with C#9 and highlighted a shift to Functional Programming within the language. However, in my experience, they have been under utilised and demoted to the league of DTO's, primitive obsession and anaemic classes. However, when we extending Records, the similarities to classes can mask the reasons for choosing Records.

What is a Record?

But first, lets identify what a Record is and why I think we are miss-using them.

Let's create an example, when building a Model to represent a Person, there are a number of Properties required. If the Model is rich, there may also be a number of relationships and navigational properties. Consider a Person, with a collection of Address items. Each Address has a Electric Meter owned by an Energy Provider.

Person
   FirstName: string

	import java.util.ArrayList;

	class Person {
	private String name;

	public Person(String name) {
	setName(name);
	}

	public String getName() {

	import React, { PropTypes } from 'react'
	const BEFOREUNLOAD = "beforeunload"; // see: http://stackoverflow.com/questions/39094138/reactjs-event-listener-beforeunload-added-but-not-removed

	class NavigationPrompt extends React.Component {
	static contextTypes = {
	router: PropTypes.object.isRequired
	}

	static defaultProps = {
	when: true

	<!DOCTYPE html>
	<html>
	<head>
	<meta name="description" content="[Todo App]">
	<script src="//fb.me/react-0.14.3.js"></script>
	<script src="//fb.me/react-dom-0.14.3.js"></script>
	<script src="https://wzrd.in/standalone/expect@latest"></script>
	<script src="https://wzrd.in/standalone/deep-freeze@latest"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/redux/3.0.5/redux.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/react-redux/4.0.6/react-redux.js"></script>

	import React from 'react'
	import { Debounce } from 'react-throttle'

	var XPos = (props) => {
	return <div>
	x: {props.x}
	</div>
	}

	var YPos = (props) => {

	import React from "react";
	import {
	Link,
	Slide,
	Text,
	Heading
	} from "spectacle";

	var MainBody = () => {
	return <div>

	using System;
	using System.Collections.Generic;
	using System.Linq;
	using System.Text;
	using System.Threading.Tasks;

	namespace Linq
	{
	using AutoMapper;
	using Newtonsoft.Json;