Working with strings 1

const airline = 'TAP air Portugal';
const plane = 'A320';

console.log(plane[0]);
console.log(plane[1]);
console.log(plane[2]);
console.log('B737'[0]);

console.log(airline.length);
console.log('B737'.length);

console.log(airline.indexOf('r'));
console.log(airline.lastIndexOf('r'));
console.log(airline.indexOf('portugal'));

console.log(airline.slice(4));
console.log(airline.slice(4, 7));

console.log(airline.slice(0, airline.indexOf(' ')));
console.log(airline.slice(airline.lastIndexOf(' ') + 1));

console.log(airline.slice(-2));
console.log(airline.slice(1, -1));

const checkMiddleSeat = function (seat) {
  //B and E are middle seats
  const s = seat.slice(-1);
  if (s === 'B' || s === 'E') console.log('You got the middle seat');
  else console.log('You got lucky');
};

checkMiddleSeat('11B');
checkMiddleSeat('23C');
checkMiddleSeat('3E');

이건 설명필요없이 이 코드들 보면서 복습하도록 하자...
콘솔창의 결과를 참조하면서 보면 복습할때 이해하기
더 쉬울것이다~~~