Diffusion Ant (master) Code

ant/examples/spec/private_classes.js
8755416ca476master

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

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

			class Counter {
			#count = 0;
			increment() { this.#count++; }
			get value() { return this.#count; }
			}
			const counter = new Counter();
			test('private field initial', counter.value, 0);
			counter.increment();
			counter.increment();
			test('private field after increment', counter.value, 2);

			class Box {
			#content;
			constructor(val) { this.#content = val; }
			unwrap() { return this.#content; }
			}
			test('private field via constructor', new Box(42).unwrap(), 42);
			test('private field string', new Box('hello').unwrap(), 'hello');

			class Dual {
			#x = 'private';
			x = 'public';
			getPrivate() { return this.#x; }
			getPublic() { return this.x; }
			}
			const dual = new Dual();
			test('private vs public field', dual.getPrivate(), 'private');
			test('public field unaffected', dual.getPublic(), 'public');

			class Formatter {
			#prefix;
			constructor(prefix) { this.#prefix = prefix; }
			#format(str) { return this.#prefix + ': ' + str; }
			display(str) { return this.#format(str); }
			}
			test('private method', new Formatter('LOG').display('test'), 'LOG: test');

			class Methods {
			#x() { return 'private'; }
			x() { return this.#x(); }
			}
			test('private method call', new Methods().x(), 'private');

			class Temperature {
			#celsius = 0;
			get #c() { return this.#celsius; }
			set #c(val) { this.#celsius = val; }
			get fahrenheit() { return this.#c * 9 / 5 + 32; }
			set fahrenheit(val) { this.#c = (val - 32) * 5 / 9; }
			}
			const temp = new Temperature();
			test('private getter initial', temp.fahrenheit, 32);
			temp.fahrenheit = 212;
			test('private setter', temp.fahrenheit, 212);

			class MathHelper {
			static #square(n) { return n * n; }
			static calc(n) { return MathHelper.#square(n); }
			}
			test('private static method', MathHelper.calc(5), 25);

			class Config {
			static #data = null;
			static get #config() { return Config.#data \|\| 'default'; }
			static set #config(val) { Config.#data = val; }
			static get() { return Config.#config; }
			static set(val) { Config.#config = val; }
			}
			test('private static getter default', Config.get(), 'default');
			Config.set('custom');
			test('private static setter', Config.get(), 'custom');

			class IdGen {
			static #next = 1;
			static generate() { return IdGen.#next++; }
			}
			test('private static field 1', IdGen.generate(), 1);
			test('private static field 2', IdGen.generate(), 2);
			test('private static field 3', IdGen.generate(), 3);

			class Computed {
			['x'] = 10;
			['y'] = 20;
			}
			const comp = new Computed();
			test('computed instance field x', comp.x, 10);
			test('computed instance field y', comp.y, 20);

			class ComputedStatic {
			static ['a'] = 100;
			static ['b'] = 200;
			}
			test('computed static field a', ComputedStatic.a, 100);
			test('computed static field b', ComputedStatic.b, 200);

			let staticVal = 0;
			class WithStaticBlock {
			static { staticVal = 42; }
			}
			test('static init block', staticVal, 42);

			let staticSum = 0;
			class MultiBlock {
			static { staticSum += 10; }
			static { staticSum += 20; }
			}
			test('multiple static blocks', staticSum, 30);

			class Animal {
			#name;
			constructor(name) { this.#name = name; }
			getName() { return this.#name; }
			}
			class Dog extends Animal {
			#breed;
			constructor(name, breed) {
			super(name);
			this.#breed = breed;
			}
			describe() { return this.getName() + ' (' + this.#breed + ')'; }
			}
			test('inherited private fields', new Dog('Rex', 'Labrador').describe(), 'Rex (Labrador)');

			summary();

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