배열과 배열 메서드 push(): const fruits = ['apple', 'banana']; fruits.push('orange'); // fruits: ['apple', 'banana', 'orange'] pop(): const fruits = ['apple', 'banana', 'orange']; const last = fruits.pop(); // last: 'orange', fruits: ['apple', 'banana'] shift(): const fruits = ['apple', 'banana', 'orange']; const first = fruits.shift(); // first: 'apple', fruits: ['banana', 'orange'] unshift(): const fr..