배열메소드-join,split,isArray

join

let arr = ["Hi", "I write","JavaScript"];
let result = arr.join(" ");  //따옴표 없애기를 쓸 때는 -->" , "
console.log(result);  //출력 "Hi I write JavaScript"이 된다

//split : join과는 반대로 문자열로 나눠서 ==>배열로 만들어준다 

const users = "Jobs,gates,bill, beatles";
const result = users.split(",");
console.log(result);  

//출력 ["Jobs","gates","bill"," beatles"]

let str= "My name is Miki";
const result = str. split(" ");
console.log(result);

//출력 ["My","name","is","Miki"]


배열과 객체 구분하기
//Array.isArray()


let user={
name : "Mike",
age:30,
};

let userList=["anna","Mirae","juliet"];

console.log(typeof user);
console.log(typeof userList);  

//둘다 object가 출력된다.

console.log(Array.isArray(user));
console.log(Array.isArray(userList));  
//false, true, 가 출력된다