Run results for: Try/finally performance impact

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:138.0) Gecko/20100101 Firefox/138.0

Browser: Firefox 138

Operating system: Windows

Device Platform: Desktop

Date tested: 28 days ago

Test name	Executions per second
Try finally	110344.9 Ops/sec
Without try finally	110362.8 Ops/sec

Script Preparation code:

function function_with_try_finally(array) {
    try {
        array.push(Math.random() * 1000000)
        array.push(Math.random() * 1000000)
        // Simulating some workload
        let sum = 0
        for (let i = 0; i < 100; i++) {
            for (let j = 0; j < i; j++) {
                sum += j * j
            }
        }
        // Randomly deciding whether to exit early
        if (Math.random() < 0.3) {
            return sum
        }
        // More workload
        for (let i = 0; i < 1000; i++) {
            for (let j = 0; j < 10; j++) {
                sum += j * j
            }
        }
        // Another random exit point
        if (Math.random() < 0.6) {
            return sum
        }
        if (array.length < 500) {
            function_with_try_finally(array)
            return 0
        }
    } finally {
        // Cleanup action: array.pop()
        array.pop()
    }
    return -1
}

function function_with_explicit_cleanup(array) {
    array.push(Math.random() * 1000000)
    array.push(Math.random() * 1000000)
    // Simulating some workload
    let sum = 0
    for (let i = 0; i < 100; i++) {
        for (let j = 0; j < i; j++) {
            sum += j * j
        }
    }
    // Randomly deciding whether to exit early
    if (Math.random() < 0.3) {
        array.pop()
        return sum
    }
    // More workload
    for (let i = 0; i < 1000; i++) {
        for (let j = 0; j < 10; j++) {
            sum += j * j
        }
    }
    // Another random exit point
    if (Math.random() < 0.6) {
        array.pop()
        return sum
    }
    if (array.length < 500) {
        function_with_try_finally(array)
        array.pop()
        return 0
    }
    // Cleanup action: array.pop()
    array.pop()
    return -1
}

Tests:

Try finally
function_with_try_finally([])
Without try finally
function_with_explicit_cleanup([])

Run results for: Try/finally performance impact

Try finally

Without try finally