Example 5-8. A traditional try/catch/finally block

function getData() {
	var timestamp = performance.now();
	try {
		// Fetch data
		// ...
	} catch (err) {
		// Bubble error up to code that called this function
		throw err;
	} finally {
		// Log time taken regardless of whether the preceding code throws an error
		console.log('getData() took ' + (performance.now() - timestamp));
	}
}

// Console output:
// getData() took 0.030000000158906914