try...catch...finally

We can add one more construct to try...catch called finally, this code executes in all cases. i.e. after try when there is no error and after a catch in case of error. The syntax for try ...catch...finally is shown below.

try {
   // try to execute the code
} catch (err) {
    // handle errors 
} finally {
   // execute always
}

Running real-world example code.

try {
  alert( 'try' );
} catch (err) {
  alert( 'catch' );
} finally {
  alert( 'finally' );
}

In the above example, the try block is executed first which is then followed by finally as there are no errors.

function divideNumbers(numerator, denominator) {
  let result;
    try {
      result = numerator / denominator;
    } catch (error) {
      console.error(`Error: ${error}`);
    } finally {
      console.log('Function finished executing');
    }
    return result;
  }
let answer = divideNumbers(10, 2);

assert(answer == 5);