Diffusion Ant (slabs) Code

ant/examples/spec/classes.js
327d21970a03slabs

classes.js
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			import { test, summary } from './helpers.js';

			console.log('Class Tests\n');

			class Person {
			constructor(name, age) {
			this.name = name;
			this.age = age;
			}
			}

			let person = new Person('Alice', 30);
			test('constructor sets name', person.name, 'Alice');
			test('constructor sets age', person.age, 30);

			class Calculator {
			constructor(value) {
			this.value = value;
			}
			add(n) {
			this.value = this.value + n;
			return this.value;
			}
			subtract(n) {
			this.value = this.value - n;
			return this.value;
			}
			}

			let calc = new Calculator(10);
			test('method add', calc.add(5), 15);
			test('method subtract', calc.subtract(3), 12);

			class Point {
			setCoords(x, y) {
			this.x = x;
			this.y = y;
			}
			getDistance() {
			return this.x * this.x + this.y * this.y;
			}
			}

			let p = new Point();
			p.setCoords(3, 4);
			test('no constructor class', p.getDistance(), 25);

			class Counter {
			constructor(start) {
			this.count = start;
			}
			increment() {
			this.count = this.count + 1;
			return this.count;
			}
			}

			let c1 = new Counter(0);
			let c2 = new Counter(10);
			test('instance isolation c1', c1.increment(), 1);
			test('instance isolation c2', c2.increment(), 11);

			test('typeof instance', typeof person, 'object');
			test('instanceof Object', person instanceof Object, true);

			class Rectangle {
			constructor(width, height) {
			this.width = width;
			this.height = height;
			}
			area() {
			return this.width * this.height;
			}
			}

			let rect = new Rectangle(5, 10);
			test('method uses props', rect.area(), 50);
			rect.width = 8;
			test('modified prop', rect.area(), 80);

			let p2 = new Person('Charlie', 35);
			delete p2.name;
			test('delete property', p2.name, undefined);
			test('other prop still exists', p2.age, 35);

			class Chainable {
			constructor(value) {
			this.value = value;
			}
			add(n) {
			this.value = this.value + n;
			return this;
			}
			multiply(n) {
			this.value = this.value * n;
			return this;
			}
			get() {
			return this.value;
			}
			}

			let chain = new Chainable(5);
			test('method chaining', chain.add(3).multiply(2).get(), 16);

			class Feature {
			constructor(name) {
			this.name = name;
			this.enabled = false;
			}
			enable() {
			this.enabled = true;
			}
			disable() {
			this.enabled = false;
			}
			}

			let feature = new Feature('DarkMode');
			test('initial bool prop', feature.enabled, false);
			feature.enable();
			test('toggle bool prop', feature.enabled, true);

			class Animal {
			constructor(name) {
			this.name = name;
			}
			speak() {
			return this.name + ' makes a sound';
			}
			}

			class Dog extends Animal {
			speak() {
			return this.name + ' barks';
			}
			}

			let dog = new Dog('Rex');
			test('inheritance', dog.speak(), 'Rex barks');
			test('instanceof parent', dog instanceof Animal, true);
			test('instanceof child', dog instanceof Dog, true);

			class Cat extends Animal {
			speak() {
			return super.speak() + ' - meow!';
			}
			}

			let cat = new Cat('Whiskers');
			test('super.method()', cat.speak(), 'Whiskers makes a sound - meow!');

			class Bird extends Animal {
			speak() {
			let method = 'speak';
			return super[method]() + ' - chirp!';
			}
			}

			let bird = new Bird('Tweety');
			test('super[method]()', bird.speak(), 'Tweety makes a sound - chirp!');

			class Static {
			static value = 42;
			static method() {
			return 'static';
			}
			}

			test('static property', Static.value, 42);
			test('static method', Static.method(), 'static');

			class BankAccount {
			#balance = 0;

			constructor(initialBalance) {
			this.#balance = initialBalance;
			}

			deposit(amount) {
			this.#balance = this.#balance + amount;
			return this.#balance;
			}

			withdraw(amount) {
			this.#balance = this.#balance - amount;
			return this.#balance;
			}

			getBalance() {
			return this.#balance;
			}
			}

			let account = new BankAccount(100);
			test('private field initializer', account.getBalance(), 100);
			test('private field deposit', account.deposit(50), 150);
			test('private field withdraw', account.withdraw(30), 120);

			class Vehicle {
			#speed = 0;

			constructor(initialSpeed) {
			this.#speed = initialSpeed;
			}

			getSpeed() {
			return this.#speed;
			}

			accelerate(amount) {
			this.#speed = this.#speed + amount;
			}
			}

			class Car extends Vehicle {
			#model;

			constructor(model, speed) {
			super(speed);
			this.#model = model;
			}

			getModel() {
			return this.#model;
			}
			}

			let car = new Car('Tesla', 0);
			test('inherited private field', car.getSpeed(), 0);
			car.accelerate(50);
			test('inherited method with private field', car.getSpeed(), 50);
			test('own private field', car.getModel(), 'Tesla');

			class Accumulator {
			count = 0;

			increment() {
			this.count = this.count + 1;
			return this.count;
			}
			}

			let accumulator = new Accumulator();
			test('field initializer', accumulator.count, 0);
			test('method with initialized field', accumulator.increment(), 1);

			class Temperature {
			#celsius = 0;

			constructor(celsius) {
			this.#celsius = celsius;
			}

			get fahrenheit() {
			return (this.#celsius * 9) / 5 + 32;
			}

			set fahrenheit(f) {
			this.#celsius = ((f - 32) * 5) / 9;
			}
			}

			let temp = new Temperature(0);
			test('getter', temp.fahrenheit, 32);
			temp.fahrenheit = 212;
			test('setter', Math.round(temp.fahrenheit), 212);

			summary();

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