Array 객체
const arr10 =[100,200,300,400,500];
const arr20 =[600,700,800,900,1000];
document.write(arr10,"<br>");
document.write(arr10.join('*'),"<br>");
document.write(arr10.reverse(),"<br>");
document.write(arr10.sort(function(a,b){return b - a}),"<br>");
document.write(arr10.sort(function(a,b){return a - b}),"<br>");
document.write(arr10.slice(1,3),"<br>");
document.write(arr10.slice(2,3),"<br>");
document.write(arr10.concat(arr20),"<br>");
document.write(arr10.shift(),"<br>");
document.write(arr10,"<br>");
document.write(arr10.unshift(100),"<br>");
document.write(arr10,"<br>");
document.write(arr10.pop(),"<br>");
document.write(arr10,"<br>");102p 예제
103p 예제
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