왕초보 자바스크립트(코딩앙마) #12 객체 (object)

 

 

 

const superman = {
  name : 'clark',
  age : 30,
}

superman.haircolor = 'black'; // 추가
superman['hobby'] = 'football'; // 추가
console.log(superman.name)
delete superman.age;
console.log(superman)

 

function makeObject(name, age){
  return{
    name : name,    // name으로 축약가능
    age : age,       / age로 축약가능
    hobby : 'football'
  }
}

const Mike = makeObject('Mike', 30)
console.log(Mike);

 

console.log('age' in Mike)          // true
console.log('birthday' in Mike)              //false

 

function isAdult(user){
  if(!('age' in user) ||    // user에 age가 없거나
     user.age <20) {    // 20살 미만이거나
    return false;
  }
  return true;
}

const Mike = {
  name : "Mike",
  age : 30
};

const Jane = {
  name: "Jane"
}

console.log(isAdult(Mike))    // true
console.log(isAdult(Jane))    /// false

const Mike = {
  name : "Mike",
  age : 30
};

for (x in Mike)
console.log(x)    // name, age가 찍힘

const Mike = {
  name : "Mike",
  age : 30
};

for (x in Mike){
  console.log(Mike[x]) // Mike['name'] 돌고 그다음 Mike['age'] 
}