Applying exception types in JavaScript

Suppose we have a function that accepts JSON with an array of data as a parameter and save each array element to a local storage:

javascriptfunction saveData(json) {
  let arr = JSON.parse(json);
  
  for (let i = 0; i < arr.length; i++) {
    localStorage.setItem(i, arr[i]);
  }
}

In this function, an exception can occur in two places: when parsing JSON and when trying to save data to a local storage.

Let, for example, as error handling, we decided to display some message about problems:

javascripttry {
  saveData('{1,2,3,4,5}');
} catch (error) {
  alert('any problems');
}

Our message is, of course, good, but it doesn't differentiate the problems that have arisen. It would be more logical to display a message about what kind of problem arose.

To do this, we will distinguish by name the errors that have occurred:

javascripttry {
  saveData('{1,2,3,4,5}');
} catch (error) {
  if (error.name == 'QuotaExceededError') {
    alert('ran out of storage space');
  }
  
  if (error.name == 'SyntaxError') {
    alert('incorrect JSON');
  }
}