Benchmark: Testing change event handlers

HTML Preparation code:

<form><input id="number" type="text"/><input id="cvc" type="text"/><input id="expire" type="text"/><button id="submit" type="submit" disabled>SUBMIT</button></form>

Script Preparation code:

const card = { number: false, cvc: false, expire: false };
let submit = document.getElementById('submit');
let number = document.getElementById('number');
let cvc = document.getElementById('cvc');
let expire = document.getElementById('expire');
const onChangeHandler = function(event) {
  const key = event.target.id;
  if(!event.empty) {
    card[key] = true;
    card.cvc ? event.target.addEventListener('change', onChangeHandler): undefined;
    card.expire ? event.target.addEventListener('change', onChangeHandler): undefined;
  }
  card[key] ? event.target.removeEventListener('change', onChangeHandler): undefined;
  if(card.number && card.cvc && card.expire) {
    submit.removeAttribute('disabled');
    number.removeEventListener('change', onChangeHandler);
    cvc.removeEventListener('change', onChangeHandler);
    expire.removeEventListener('change', onChangeHandler);
    submit.innerText = submit.disabled.toString();
  }
};

Tests:

a
number.addEventListener('change', this.onChangeHandler); //cvc.addEventListener('change', this.onChangeHandler); //expire.addEventListener('change', this.onChangeHandler); number.value = "4242 4242 4242 4242"; number.dispatchEvent(new Event('change')); cvc.value = "333"; cvc.dispatchEvent(new Event('change')); expire.value = "02/22"; expire.dispatchEvent(new Event('change'));
b
number.addEventListener('change', this.onChangeHandler); //cvc.addEventListener('change', this.onChangeHandler); //expire.addEventListener('change', this.onChangeHandler); number.value = "4242 4242 4242 4242"; number.dispatchEvent(new Event('change')); cvc.value = "333"; cvc.dispatchEvent(new Event('change')); expire.value = "02/22"; expire.dispatchEvent(new Event('change'));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
a
b

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Definition**

The provided JSON represents a benchmark for testing change event handlers in JavaScript. The script preparation code defines several HTML input elements, including `number`, `cvc`, and `expire`. These elements are connected to a `onChangeHandler` function that updates the state of the `card` object, which is used to determine when all fields are filled out.

**Options Compared**

There are two test cases (a and b) that compare different approaches:

1. **Test Case "a"**: This test case adds an event listener to only one field (`number`) and dispatches a `change` event on that field.
2. **Test Case "b"**: This test case adds an event listener to all fields (`number`, `cvc`, and `expire`) and dispatches a `change` event on each of them.

**Pros and Cons**

1. **Test Case "a"**:
	* Pros: May be faster since only one field is being updated.
	* Cons: May not accurately represent real-world scenarios where all fields need to be filled out simultaneously.
2. **Test Case "b"**:
	* Pros: More representative of real-world scenarios, but may be slower due to the additional event listeners and dispatches.
	* Cons: May be slower due to the overhead of adding and removing event listeners for each field.

**Library**

There is no specific library mentioned in the benchmark definition. However, the `addEventListener` method is used to add event listeners to the input elements, which is a standard JavaScript API.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntaxes used in this benchmark.

**Other Considerations**

When testing change event handlers, it's essential to consider the following:

* The impact of adding and removing event listeners on performance.
* The accuracy of the test results in representing real-world scenarios.
* The potential for event listener leaks if not properly cleaned up.

**Alternatives**

If you're looking to optimize or modify this benchmark, here are some alternatives to consider:

1. **Use a more efficient way to update the state**: Instead of using the `card` object and manually updating its properties, consider using a library like Lodash's `assignInPlace` method.
2. **Use a faster dispatching mechanism**: Consider using a library like Fastdom or React Test Renderer for faster dispatching of events.
3. **Run multiple iterations**: Run each test case multiple times to increase the execution count and improve accuracy.

Keep in mind that these alternatives may require adjustments to the benchmark definition and preparation code.

Related benchmarks:

Testing change event handlers (version: 0)

Comparing performance of: a vs b

Created: 5 years ago by: Guest

Jump to the latest result

a

b

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):