const cafe = ['coffee', 'cake', 'tea', 'cookie'];
document.write('배열 : [ ', cafe,' ]<br><br>');
const first1 = cafe.shift();
document.write('1. shift <br> 제거된 첫 번째 항목 : ', first1,'<br>');
document.write('제거 후 배열 : ', cafe,'<br><br>');
const first2 = cafe.unshift('bread');
document.write('2. unshift <br> 제거 후 배열 : ', cafe,'<br><br>');
const last1 = cafe.pop();
document.write('3. pop <br> 제거된 마지막 항목 : ', last1,'<br>');
document.write('제거 후 배열 : ', cafe,'<br><br>');
const last2 = cafe.push('toast');
document.write('4. push <br> 삽입 후 배열 : ', cafe);
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