javascript-with-sai/scope.html at master · junaid537/javascript-with-sai · GitHub

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<!--output:
A local variable
A local variable-->


<!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>
        var a = 12;
        (function() {
        console.log(a);
        })();
//o/p :12

        //2
        var a = 5;
        (function() {
        var a = 12;
        console.log(a);
        })();
//o/p:12
        //3
        var a = 10;
        var x = (function() {
        var a = 12;
        return (function() {
        console.log(a);
         });
        })();
        x();
//o/p:12

        //4
        var a = 10;
        var x = (function() {
        var y = function() {
        var a = 12;
        };
        return function() {
        console.log(a);
        }
        })();
        x();
//o/p:10

        //5
        var a = 10;
        var x = (function() {
        (function() {
        a = 12; // <<< look carefully at this line.
        })();
        return (function() {
        console.log(a);
        });
        })();
        x();
//o/p:12
        //6.
        var a = 10;
        (function() {
        var a = 15;
        window.x = function() {
        console.log(a);
        }
        })();
        x();
//o/p:15
    </script>
</body>
</html>