자바스크립트 객체와 클래스

객체와 클래스

javascript에는 객체를 만드는 여러가지 방법

// Create a user with object literal
var user = {
  name: 'Sunny',
  interests: ['Traveling', 'Swimming'],
  greeting: function () {
  console.log('Hi, I\'m ' + this.name + '.');
  }
}
user.greeting();// Hi, I'm Sunny.

// Create a constructor function
function User (name, interests) {
this.name = name;
this.interests = interests;
this.greeting = function () {
console.log('Hi, I\'m ' + this.name + '.');
}
}
// Call the constructor with new to create a user object
var user = new User('Sunny', ['Traveling', 'Swimming']);
user.greeting(); // Hi, I'm Sunny.

Object.create() 방법

var user = Object.create(User.prototype, {
    name: { value: 'Sunny' },
    interests: { value: ['Traveling', 'Swimming']}
    });
User.prototype.greeting = function () {
    console.log('Hi, I\'m ' + this.name + '.');
    }    

함수메서드 방법

function createUser (name, interests) {
    var user = {};
    user.name = name;
    user.interests = interests;
    user.greeting = function () {
        console.log('Hi, I\'m ' + this.name + '.');
    };
    return user;
}

var user = createUser('Sunny', ['Traveling', 'Swimming']);
user.greeting(); // Hi, I'm Sunny.

ES6 클래스 사용 방법

// Create User class
class User {
    // Equivalent to User constructor function
    constructor (name, interests) {
    this.name = name;
    this.interests = interests;
    }
    // Equivalent to User.prototype.greeting
    greeting () {
    console.log('Hi, I\'m ' + this.name + '.')
    }
}

클래스 expression 방법

// Use class expression
let User = class {
    constructor (name, interests) {
    this.name = name;
    this.interests = interests;
    }
    greeting () {
        console.log('Hi, I\'m ' + this.name + '.')
    } 
}