Diffusion Ant (ast) Code

ant/tests/this_demo.cjs
32b18f1b1662ast

this_demo.cjs
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			// Demonstration of 'this' keyword and 'new' operator

			console.log("=== Constructor Functions with 'new' and 'this' ===\n");

			// Basic constructor function
			function Person(name, age) {
			this.name = name;
			this.age = age;
			this.greet = function() {
			return "Hello, my name is " + this.name + " and I am " + this.age + " years old.";
			};
			}

			// Create instances using 'new'
			console.log("Creating person1 with new Person('Alice', 30)");
			let person1 = new Person("Alice", 30);
			console.log("person1.name:", person1.name);
			console.log("person1.age:", person1.age);
			console.log("person1.greet():", person1.greet());
			console.log();

			console.log("Creating person2 with new Person('Bob', 25)");
			let person2 = new Person("Bob", 25);
			console.log("person2.name:", person2.name);
			console.log("person2.age:", person2.age);
			console.log("person2.greet():", person2.greet());
			console.log();

			// Each instance has its own 'this' context
			console.log("=== Independent 'this' contexts ===");
			console.log("person1.name:", person1.name);
			console.log("person2.name:", person2.name);
			console.log("They are different instances with independent 'this' values");
			console.log();

			// Constructor with methods that use 'this'
			function Counter(start) {
			this.value = start;
			this.increment = function() {
			this.value = this.value + 1;
			return this.value;
			};
			this.decrement = function() {
			this.value = this.value - 1;
			return this.value;
			};
			this.getValue = function() {
			return this.value;
			};
			}

			console.log("=== Counter Example ===");
			let counter = new Counter(10);
			console.log("Initial value:", counter.getValue());
			console.log("After increment:", counter.increment());
			console.log("After increment:", counter.increment());
			console.log("After decrement:", counter.decrement());
			console.log("Final value:", counter.getValue());
			console.log();

			// Multiple counters with independent state
			console.log("=== Multiple Independent Counters ===");
			let counter1 = new Counter(0);
			let counter2 = new Counter(100);

			console.log("counter1 initial:", counter1.getValue());
			console.log("counter2 initial:", counter2.getValue());

			counter1.increment();
			counter1.increment();
			counter2.decrement();

			console.log("counter1 after 2 increments:", counter1.getValue());
			console.log("counter2 after 1 decrement:", counter2.getValue());
			console.log();

			// Constructor with computed properties
			function Rectangle(width, height) {
			this.width = width;
			this.height = height;
			this.area = function() {
			return this.width * this.height;
			};
			this.perimeter = function() {
			return 2 * (this.width + this.height);
			};
			}

			console.log("=== Rectangle Example ===");
			let rect1 = new Rectangle(5, 10);
			console.log("Rectangle 5x10:");
			console.log(" Width:", rect1.width);
			console.log(" Height:", rect1.height);
			console.log(" Area:", rect1.area());
			console.log(" Perimeter:", rect1.perimeter());
			console.log();

			let rect2 = new Rectangle(3, 7);
			console.log("Rectangle 3x7:");
			console.log(" Width:", rect2.width);
			console.log(" Height:", rect2.height);
			console.log(" Area:", rect2.area());
			console.log(" Perimeter:", rect2.perimeter());
			console.log();

			// 'this' refers to the object being constructed
			function Car(make, model, year) {
			this.make = make;
			this.model = model;
			this.year = year;
			this.displayInfo = function() {
			return this.year + " " + this.make + " " + this.model;
			};
			}

			console.log("=== Car Example ===");
			let car1 = new Car("Toyota", "Camry", 2020);
			let car2 = new Car("Honda", "Civic", 2021);

			console.log("car1:", car1.displayInfo());
			console.log("car2:", car2.displayInfo());
			console.log();

			// 'this' in nested functions
			function Account(owner, balance) {
			this.owner = owner;
			this.balance = balance;

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

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

			this.getInfo = function() {
			return this.owner + " has $" + this.balance;
			};
			}

			console.log("=== Bank Account Example ===");
			let account1 = new Account("Alice", 1000);
			console.log("Initial:", account1.getInfo());

			account1.deposit(500);
			console.log("After deposit 500:", account1.getInfo());

			account1.withdraw(200);
			console.log("After withdraw 200:", account1.getInfo());
			console.log();

			// Multiple accounts
			let account2 = new Account("Bob", 2000);
			console.log("account1:", account1.getInfo());
			console.log("account2:", account2.getInfo());
			console.log();

			console.log("=== Summary ===");
			console.log("- 'new' creates a new object");
			console.log("- 'this' inside constructor refers to the new object");
			console.log("- Each instance has its own 'this' context");
			console.log("- Methods can access and modify 'this' properties");

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