JS) 객체배열에서 배열 없애기 [ {}, {} ] => {}, {}

1. map 

const extractedCards1 = cards.map(card1 => {
  console.log('card1: ', card1);
  return card1
});
console.log('extractedCards1: ', extractedCards1);

//print
card1:  {}
card1:  {}
extractedCards1:  [ {}, {} ]

 

2. forEach 

cards.forEach(card2 => {
  console.log("card2:", card2);
});

//print
card2: {}
card2: {}

 

3. for 

for (let i = 0; i < cards.length; i++) {
  console.log("3",cards[i]);
}

//print
3 {}
3 {}

 

4. for...of 

for (const card4 of cards) {
  console.log( card4);
}

//print
{}
{}