Challenge 3 — Solution

Task: Write a function riskyOperation(shouldFail) that throws a
RangeError if shouldFail is true, otherwise returns "Success". Wrap
a call in try/catch/finally: log the result or the error's
name+message in catch, and always log "Operation complete" in
finally, regardless of outcome. Call it twice, once with each
boolean.

function riskyOperation(shouldFail) {
    if (shouldFail) {
        throw new RangeError("Operation exceeded allowed range");
    }
    return "Success";
}

function runOperation(shouldFail) {
    try {
        const result = riskyOperation(shouldFail);
        console.log(result);
    } catch (error) {
        console.log(`${error.name}: ${error.message}`);
    } finally {
        console.log("Operation complete");
    }
}

runOperation(false);
runOperation(true);


Expected output:

Success
Operation complete
RangeError: Operation exceeded allowed range
Operation complete


Notes:
- RangeError is one of JavaScript's built-in error types (alongside
  Error, TypeError, SyntaxError) — created the same way as a plain
  Error, just with a more specific name already set automatically.
- finally runs after BOTH the successful call (runOperation(false))
  and the failing one (runOperation(true)) — "Operation complete"
  appears in both cases, proving it isn't conditional on whether an
  error was thrown.
- error.name here is "RangeError", not the generic "Error" — that
  distinction comes for free from using RangeError specifically
  instead of new Error(...).