Handling specific errors in JavaScript (think exceptions)

Question

How would you implement different types of errors, so you\'d be able to catch specific ones and let others bubble up..?

One way to achieve this is to modify the

Answer 1

try-catch-finally.js

Using try-catch-finally.js, you can call the _try function with an anonymous callback, which it will call, and you can chain .catch calls to catch specific errors, and a .finally call to execute either way.

Example

_try(function () {
    throw 'My error';
})
.catch(Error, function (e) {
    console.log('Caught Error: ' + e);
})
.catch(String, function (e) {
    console.log('Caught String: ' + e);
})
.catch(function (e) {
    console.log('Caught other: ' + e);
})
.finally(function () {
    console.log('Error was caught explicitly');
});

Example with modern arrow functions and template literals

_try(() => {
  throw 'My error';
}).catch(Error, e => {
  console.log(`Caught Error: ${e}`);
}).catch(String, e => {
  console.log(`Caught String: ${e}`);
}).catch(e => {
  console.log(`Caught other: ${e}`);
}).finally(() => {
  console.log('Error was caught explicitly');
});