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class.cjs
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class.cjs
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// Test class keyword
console.log("=== Testing class keyword ===");
// Test 1: Simple class with constructor
class Person {
constructor(name, age) {
this.name = name;
this.age = age;
}
}
let person1 = new Person("Alice", 30);
console.log(person1.name); // "Alice"
console.log(person1.age); // 30
// Test 2: Class with methods
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;
}
getValue() {
return this.value;
}
}
let calc = new Calculator(10);
console.log(calc.value); // 10
console.log(calc.add(5)); // 15
console.log(calc.subtract(3)); // 12
console.log(calc.getValue()); // 12
// Test 3: Class without explicit constructor
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);
console.log(p.x); // 3
console.log(p.y); // 4
console.log(p.getDistance()); // 25
// Test 4: Multiple instances
class Counter {
constructor(start) {
this.count = start;
}
increment() {
this.count = this.count + 1;
return this.count;
}
}
let counter1 = new Counter(0);
let counter2 = new Counter(10);
console.log(counter1.increment()); // 1
console.log(counter1.increment()); // 2
console.log(counter2.increment()); // 11
console.log(counter2.increment()); // 12
// Test 5: Class instances are objects
let person2 = new Person("Bob", 25);
console.log(typeof person2); // object
console.log(person2 instanceof Object); // true
// Test 6: Modify instance properties
class Rectangle {
constructor(width, height) {
this.width = width;
this.height = height;
}
area() {
return this.width * this.height;
}
}
let rect = new Rectangle(5, 10);
console.log(rect.area()); // 50
rect.width = 8;
console.log(rect.area()); // 80
// Test 7: Delete class instance properties
let person3 = new Person("Charlie", 35);
console.log(person3.name); // "Charlie"
delete person3.name;
console.log(person3.name); // undefined
console.log(person3.age); // 35
// Test 8: Class with property management
class Store {
constructor() {
this.items = 0;
}
addItem(name, value) {
this.items = this.items + 1;
}
removeItem(name) {
this.items = this.items - 1;
return true;
}
getItemCount() {
return this.items;
}
}
let store = new Store();
console.log(store.getItemCount()); // 0
store.addItem("apple", 5);
store.addItem("banana", 3);
console.log(store.getItemCount()); // 2
store.removeItem("apple");
console.log(store.getItemCount()); // 1
// Test 9: Method chaining
class ChainableCounter {
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 ChainableCounter(5);
let result = chain.add(3).multiply(2).get();
console.log(result); // 16
// Test 10: Class with boolean properties
class Feature {
constructor(name) {
this.name = name;
this.enabled = false;
}
enable() {
this.enabled = true;
}
disable() {
this.enabled = false;
}
isEnabled() {
return this.enabled;
}
}
let feature = new Feature("DarkMode");
console.log(feature.isEnabled()); // false
feature.enable();
console.log(feature.isEnabled()); // true
feature.disable();
console.log(feature.isEnabled()); // false
console.log("=== Class tests completed ===");

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