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ant/tests/test_default_params.cjs
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test_default_params.cjs
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			// Test default parameters in function definitions

			// Test 1: Basic default parameter
			function greet(name = 'World') {
			return 'Hello, ' + name;
			}

			console.log("Test 1 - Basic default param:");
			console.log(greet()); // Should print "Hello, World"
			console.log(greet('Alice')); // Should print "Hello, Alice"

			// Test 2: Multiple default parameters
			function multiply(a = 1, b = 1, c = 1) {
			return a * b * c;
			}

			console.log("\nTest 2 - Multiple default params:");
			console.log(multiply()); // Should print 1
			console.log(multiply(2)); // Should print 2
			console.log(multiply(2, 3)); // Should print 6
			console.log(multiply(2, 3, 4)); // Should print 24

			// Test 3: Mix of regular and default parameters
			function describe(name, age = 25, city = 'Unknown') {
			return name + ' is ' + age + ' years old and lives in ' + city;
			}

			console.log("\nTest 3 - Mix of regular and default params:");
			console.log(describe('Alice')); // Should print "Alice is 25 years old and lives in Unknown"
			console.log(describe('Bob', 30)); // Should print "Bob is 30 years old and lives in Unknown"
			console.log(describe('Charlie', 35, 'NYC')); // Should print "Charlie is 35 years old and lives in NYC"

			// Test 4: Default parameter with number
			function power(base = 2, exponent = 2) {
			let result = 1;
			for (let i = 0; i < exponent; i++) {
			result = result * base;
			}
			return result;
			}

			console.log("\nTest 4 - Default params with numbers:");
			console.log(power()); // Should print 4 (2^2)
			console.log(power(3)); // Should print 9 (3^2)
			console.log(power(2, 3)); // Should print 8 (2^3)

			// Test 5: Arrow function with default parameters
			const add = (a = 0, b = 0) => a + b;

			console.log("\nTest 5 - Arrow function with default params:");
			console.log(add()); // Should print 0
			console.log(add(5)); // Should print 5
			console.log(add(5, 3)); // Should print 8

			// Test 6: Class methods with default parameters
			class Calculator {
			add(x = 0, y = 0) {
			return x + y;
			}

			subtract(x = 0, y = 0) {
			return x - y;
			}

			multiply(x = 1, y = 1) {
			return x * y;
			}
			}

			console.log("\nTest 6 - Class methods with default params:");
			const calc = new Calculator();
			console.log(calc.add()); // Should print 0
			console.log(calc.add(10)); // Should print 10
			console.log(calc.add(10, 5)); // Should print 15
			console.log(calc.multiply()); // Should print 1
			console.log(calc.multiply(3)); // Should print 3
			console.log(calc.multiply(3, 4)); // Should print 12

			// Test 7: Default params with special characters in strings
			function wrap(text, left = '(', right = ')') {
			return left + text + right;
			}

			console.log("\nTest 7 - Default params with parens in strings:");
			console.log(wrap('hello')); // Should print "(hello)"
			console.log(wrap('hello', '<', '>')); // Should print "<hello>"
			console.log(wrap('hello', '[')); // Should print "[hello)"

			// Test 8: Default with undefined explicitly passed
			function testUndefined(a = 'default') {
			return a;
			}

			console.log("\nTest 8 - Explicit undefined uses default:");
			console.log(testUndefined()); // Should print "default"
			console.log(testUndefined(undefined)); // Should print "default"
			console.log(testUndefined('value')); // Should print "value"

			// Test 9: Complex default expressions
			function createArray(size = 5, fill = 'x') {
			let arr = [];
			for (let i = 0; i < size; i++) {
			arr.push(fill);
			}
			return arr;
			}

			console.log("\nTest 9 - Default params with expressions:");
			console.log(createArray().length); // Should print 5
			console.log(createArray(3).length); // Should print 3
			console.log(createArray(2, 'o').join('')); // Should print "oo"

			// Test 10: Async function with default parameters
			async function asyncGreet(name = 'Async World') {
			return 'Hello, ' + name;
			}

			console.log("\nTest 10 - Async function with default params:");
			asyncGreet().then(result => console.log(result)); // Should print "Hello, Async World"
			asyncGreet('Async Alice').then(result => console.log(result)); // Should print "Hello, Async Alice"

			// Test 11: Default parameters in constructor
			class Person {
			constructor(name = 'Anonymous', age = 0) {
			this.name = name;
			this.age = age;
			}

			introduce() {
			return this.name + ' is ' + this.age;
			}
			}

			console.log("\nTest 11 - Constructor with default params:");
			const p1 = new Person();
			console.log(p1.introduce()); // Should print "Anonymous is 0"
			const p2 = new Person('Dave');
			console.log(p2.introduce()); // Should print "Dave is 0"
			const p3 = new Person('Eve', 28);
			console.log(p3.introduce()); // Should print "Eve is 28"

			// Test 12: Only last parameters have defaults
			function compute(required, optional = 10) {
			return required + optional;
			}

			console.log("\nTest 12 - Required param then default:");
			console.log(compute(5)); // Should print 15
			console.log(compute(5, 20)); // Should print 25

			console.log("\n✓ All default parameter tests completed!");

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