javascript try catch finally

JavaScript
try {
  nonExistentFunction();
} catch (error) {
  console.error(error);
  // expected output: ReferenceError: nonExistentFunction is not defined
  // Note - error messages will vary depending on browser
}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
}var someNumber = 1;
try {
  someNumber.replace("-",""); //You can't replace a int
} catch(err) {
 console.log(err);
}try { // Try to run this code
  alert( 'try' ); 
  if (confirm('Make an error?')) BAD_CODE();
} catch (e) { // Code throws error
  alert( 'catch' );
} finally { // Always run this code regardless of error or not
  alert( 'finally' );
}<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>  try {
  alert( 'try' );
  if (confirm('Make an error?')) BAD_CODE();
} catch (e) {
  alert( 'catch' );
} finally {
  alert( 'finally' );
}
Source

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