js_practice/Closure.html at master · 200wonman/js_practice · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>


    <script>
    // let add =  function add2(a,b) {
    //     return a+b;
    // }


    // let r = add2(1,3);
    // console.log(r);

    // let r = add2(1,3);
    // console.log(r);


    let add =  function (a,b) {
        return a+b;
    }

    //// 2

    function hhh (what) {
        let a =1;
        let b = 3;
        return what(a,b);
    }

    console.log("hi : " + hhh(add));

    (function run() {
        console.log("hi : " );
    }()/*()이게 함수 실행해줌*/);


    // 가변 인자
    let what = add(1,3,4);


    function add (...p) {
         let result = 0;
         for (const iterator of p) {
             console.log(iterator);
             result += iterator;
         }
         return result;
     }


     console.log(what);


    // 클로저 : 리턴안에 함수가 밖에서도 사용되는데 값이 계속 할당됨 <- 어따쓰지
    function add(){
        let a = 0;
        return function (){
            return a++;
        }
    }

    a = add();
    console.log(a())
    console.log(a())
    console.log(a())


    // class, 조건문, 순환문


    </script>

</body>
</html>