Programming language:Javascript

javascript try catch

2021-01-21 19:42:35

try {
  // Try to run this code 
}
catch(err) {
  // if any error, Code throws the error
}
finally {
  // Always run this code regardless of error or not
  //this block is optional
}

Greggo

Code: Javascript

2021-03-10 22:51:42

One should avoid throw errors as the way to pass error conditions
around in applications.

The throw statement should only be used
"For this should never happen, crash and burn. Do not
recover elegantly in any way"

try catch however is used in situation where host objects
or ECMAScript may throw errors.

Example:
-------------------------------------
var json
try {
    json = JSON.parse(input)
} catch (e) {
    // invalid json input, set to null
    json = null
}
-------------------------------------

Andrzej

Code: Javascript

2021-03-03 13:13:46

var someNumber = 1;
try {
  someNumber.replace("-",""); //You can't replace a int
} catch(err) {
 console.log(err);
}

Ender A. Rencuzoğulları

Code: Javascript

2021-02-24 20:06:49

try {
  // Try to run this code
}
catch(err) {
  // Code throws error
}
finally {
  // Always run this code regardless of error or not
}

Skyblue

Code: Javascript

2021-03-03 13:12:10

"The try...catch statement marks a block of statements to try and specifies"
"a response should an exception be thrown."

try {
  nonExistentFunction();
} catch (error) {
  console.error(error);
  // expected output: ReferenceError: nonExistentFunction is not defined
  // Note - error messages will vary depending on browser
}

Sarah

Code: Javascript

2021-01-21 19:40:41

<html>  
<head>Exception Handling</head>  
<body>  
<script>  
try {  
   throw new Error('This is the throw keyword'); //user-defined throw statement.  
}  
catch (e) {  
  document.write(e.message); // This will generate an error message  
}  
</script>  
</body>  
</html>

Kor.SinoExpert

Code: Javascript

2021-03-03 13:09:42

try {

  alert('Start of try runs');  // (1) <--

  lalala; // error, variable is not defined!

  alert('End of try (never reached)');  // (2)

} catch(err) {

  alert(`Error has occurred!`); // (3) <--

}

Laurie Hawkins

Code: Javascript

2021-06-27 01:19:09

try {
  alert( 'try' );
  if (confirm('Make an error?')) BAD_CODE();
} catch (e) {
  alert( 'catch' );
} finally {
  alert( 'finally' );
}

Xinfinity

Code: Javascript

2021-07-14 17:43:36


 <p id="demo"></p>

<script>

try {
  adddlert("Welcome guest!");
}
catch(err) {
  
document.getElementById("demo").innerHTML = err.message;
}
</script>

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