21-error-handling.html

<!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>error handling in js</title>
</head>
<body>
    <script>
        // error handling in js try and catch:
        // try catch error work synchronizationaly 

        // example: 01

        try {
            console.log("hello world: ")
            syaHello()
        } catch (error) {
            console.log("some error accore in code ")
            console.log(error)
        }finally{
            console.log("example 1 complete")
        }

        // example: 02

        // function sayHello() {
        //     try {
        //         setTimeout(() => {
        //         console.log(hi()) 
        //     }, 2000);
        
        //     } catch (error) {
        //         console.log(error)
        //     }
        // }

        // so above example will not generate error because the try catch error work synchronizationaly so we will give try catch error inside the setInterval

        function sayHello() {

            setTimeout(() => {
                try {
                
                console.log(hi()) 
            } catch (error) {
               
                console.log(error.name)
                console.log(message)
                console.log(error.stack)
            }finally{
            console.log("example 2 complete")
        }
        
            }, 2000);
        }

        sayHello();
         
       // now now it will catch the error 

       // some error mehonds are :
       /*
       For all built-in errors, the error object has two main properties:

1: name
Error name. For instance, for an undefined variable that’s "ReferenceError".
2: message
Textual message about error details.
There are other non-standard properties available in most environments. One of most widely used and supported is:

3: stack
Current call stack: a string with information about the sequence of nested calls that led to the error. Used for debugging purposes.
*/


    </script>
</body>
</html>