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objects.js
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280 lines (235 loc) · 6.51 KB
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/**
* Sample JavaScript file demonstrating object methods and function assignments
* This file tests methods defined in object literals and prototype assignments
*/
// Object with method definitions
const calculator = {
result: 0,
// Method shorthand syntax
add(value) {
this.result += value;
return this;
},
// Method shorthand syntax with parameters
subtract(value) {
this.result -= value;
return this;
},
// Traditional method definition
multiply: function(value) {
this.result *= value;
return this;
},
// Arrow function as method (note: 'this' behaves differently)
reset: () => {
// Note: Arrow functions don't have their own 'this'
console.log('Calculator reset');
},
// Method with complex logic
calculate(operation, value) {
switch (operation) {
case 'add':
return this.add(value);
case 'subtract':
return this.subtract(value);
case 'multiply':
return this.multiply(value);
default:
throw new Error('Unknown operation');
}
},
// Getter method
get value() {
return this.result;
},
// Setter method
set value(newValue) {
this.result = newValue;
}
};
// Object with nested methods
const api = {
baseUrl: 'https://api.example.com',
users: {
// Nested method
getAll() {
return fetch(`${this.baseUrl}/users`);
},
// Nested method with parameters
getById(id) {
return fetch(`${this.baseUrl}/users/${id}`);
},
// Async nested method
async create(userData) {
const response = await fetch(`${this.baseUrl}/users`, {
method: 'POST',
body: JSON.stringify(userData)
});
return response.json();
}
},
posts: {
getAll() {
return fetch(`${this.baseUrl}/posts`);
},
getByUserId(userId) {
return fetch(`${this.baseUrl}/posts?userId=${userId}`);
}
}
};
// Constructor function with prototype methods
function Vehicle(make, model, year) {
this.make = make;
this.model = model;
this.year = year;
}
// Prototype method assignment
Vehicle.prototype.getInfo = function() {
return `${this.year} ${this.make} ${this.model}`;
};
// Another prototype method
Vehicle.prototype.start = function() {
console.log(`Starting ${this.getInfo()}`);
};
// Prototype method with parameters
Vehicle.prototype.drive = function(distance) {
console.log(`Driving ${this.getInfo()} for ${distance} miles`);
};
// Static method assignment to constructor function
Vehicle.createElectric = function(make, model, year, batteryCapacity) {
const vehicle = new Vehicle(make, model, year);
vehicle.batteryCapacity = batteryCapacity;
vehicle.charge = function(percentage) {
console.log(`Charging to ${percentage}%`);
};
return vehicle;
};
// Object with methods that call other methods
const gameEngine = {
score: 0,
level: 1,
// Method that calls other methods
startGame() {
this.initializeLevel();
this.resetScore();
this.showWelcomeMessage();
},
initializeLevel() {
console.log(`Initializing level ${this.level}`);
},
resetScore() {
this.score = 0;
console.log('Score reset to 0');
},
showWelcomeMessage() {
console.log('Welcome to the game!');
},
// Method with callback parameter
processInput(input, callback) {
console.log(`Processing input: ${input}`);
if (callback && typeof callback === 'function') {
callback(input);
}
},
// Method that returns a function
createScoreHandler() {
return (points) => {
this.score += points;
console.log(`Score: ${this.score}`);
};
}
};
// Module pattern with private and public methods
const counterModule = (function() {
let count = 0;
// Private function
function validateIncrement(value) {
return typeof value === 'number' && value > 0;
}
// Return public interface
return {
// Public method
increment(value = 1) {
if (validateIncrement(value)) {
count += value;
}
},
// Public method
decrement(value = 1) {
if (validateIncrement(value)) {
count -= value;
}
},
// Public getter
getCount() {
return count;
},
// Public method that uses private function
reset() {
count = 0;
console.log('Counter reset');
}
};
})();
// Factory function that creates objects with methods
function createTimer(name) {
let startTime = null;
let endTime = null;
return {
name: name,
start() {
startTime = Date.now();
console.log(`Timer ${this.name} started`);
},
stop() {
endTime = Date.now();
console.log(`Timer ${this.name} stopped`);
},
getElapsed() {
if (startTime && endTime) {
return endTime - startTime;
}
return 0;
},
reset() {
startTime = null;
endTime = null;
console.log(`Timer ${this.name} reset`);
}
};
}
// Function that demonstrates object method usage
function demonstrateObjects() {
// Use calculator
calculator.add(10).multiply(2).subtract(5);
console.log('Calculator result:', calculator.value);
// Use vehicle
const car = new Vehicle('Toyota', 'Camry', 2022);
car.start();
car.drive(100);
// Use game engine
gameEngine.startGame();
const scoreHandler = gameEngine.createScoreHandler();
scoreHandler(100);
// Use counter module
counterModule.increment(5);
counterModule.decrement(2);
console.log('Counter value:', counterModule.getCount());
// Use timer factory
const timer = createTimer('TestTimer');
timer.start();
setTimeout(() => {
timer.stop();
console.log('Elapsed time:', timer.getElapsed());
}, 1000);
return {
calculator,
car,
gameEngine,
counterModule,
timer
};
}
// Export objects and functions
export { calculator, api, Vehicle, gameEngine, counterModule, createTimer };
export default demonstrateObjects;