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ant/tests/private_fields.js
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private_fields.js
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			// Test private fields in classes

			// Basic private field access
			class Rectangle {
			#width;
			#height;

			constructor(w, h) {
			this.#width = w;
			this.#height = h;
			}

			area() {
			return this.#width * this.#height;
			}
			}

			const rect = new Rectangle(5, 10);
			console.assert(rect.area() === 50, "Rectangle area should be 50");

			// Private field with getter/setter
			class Person {
			#name;
			#age;

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

			getName() {
			return this.#name;
			}

			getAge() {
			return this.#age;
			}

			setAge(newAge) {
			this.#age = newAge;
			}

			describe() {
			return this.#name + " is " + this.#age;
			}
			}

			const person = new Person("Alice", 30);
			console.assert(person.getName() === "Alice", "getName should return Alice");
			console.assert(person.getAge() === 30, "getAge should return 30");
			console.assert(person.describe() === "Alice is 30", "describe should work");
			person.setAge(31);
			console.assert(person.describe() === "Alice is 31", "setAge should work");

			// Private fields with inheritance
			class Animal {
			#species;

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

			getSpecies() {
			return this.#species;
			}
			}

			class Dog extends Animal {
			#name;

			constructor(name, species) {
			super(species);
			this.#name = name;
			}

			getName() {
			return this.#name;
			}
			}

			const dog = new Dog("Rex", "Canis familiaris");
			console.assert(dog.getName() === "Rex", "Dog getName should return Rex");
			console.assert(dog.getSpecies() === "Canis familiaris", "Dog getSpecies should work");

			// Private field with initializer
			class Counter {
			#count = 0;

			constructor(start) {
			this.#count = start;
			}

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

			getCount() {
			return this.#count;
			}
			}

			const counter = new Counter(10);
			console.assert(counter.increment() === 11, "Counter increment should return 11");
			console.assert(counter.increment() === 12, "Counter increment should return 12");
			console.assert(counter.getCount() === 12, "Counter getCount should return 12");

			// Performance test: tight loop with private fields and initializer
			class FastCounter {
			#n = 0;

			increment() {
			this.#n = this.#n + 1;
			}

			get() {
			return this.#n;
			}
			}

			const fast = new FastCounter();
			for (let i = 0; i < 1000; i = i + 1) {
			fast.increment();
			}
			console.assert(fast.get() === 1000, "FastCounter should reach 1000");

			console.log("All private fields tests passed!");

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