Benchmark: test speed - MeasureThat.net

HTML Preparation code:

<div id="foo" data-key="0" class="order-edit__stage"></div>

Tests:

1
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.getAttribute("data-key"); }
2
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.classList.contains("order-edit__stage"); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
1
2

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.

I'll break down the test cases and explain what's being tested, the options compared, pros and cons of each approach, and other considerations.

**Benchmark Description**

The benchmark is defined by a JSON object with the following properties:

* `Name`: The name of the benchmark, which is "test speed" in this case.
* `Description`: A brief description of the benchmark, which is "qwe" in this example (not very informative!).
* `Script Preparation Code` and `Html Preparation Code`: These are empty strings, indicating that no script or HTML code needs to be prepared before running the test.

**Individual Test Cases**

The benchmark consists of two individual test cases:

1. **Test Case 1**
	* The test case involves:
		+ Retrieving an element from the DOM using `document.getElementById`.
		+ Assigning a value to a variable `i` and initializing it to 1000.
		+ Entering a while loop that runs 1000 times.
		+ Inside the loop, accessing the attribute "data-key" of the retrieved element using `element.getAttribute("data-key");`.
	* The test case is executed 16824.736328125 times per second on Chrome 94 running on Windows Desktop.

2. **Test Case 2**
	* This test case is identical to Test Case 1, except that it accesses the class list of the element using `element.classList.contains("order-edit__stage");` instead of accessing an attribute.
	* The test case is executed 14474.7109375 times per second on Chrome 94 running on Windows Desktop.

**Comparison of Options**

The two test cases differ only in how they access the "data-key" attribute:

1. **Attribute-based approach**: `element.getAttribute("data-key");` (Test Case 1)
	* Pros:
		+ More explicit and readable.
	* Cons:
		+ May have additional overhead due to attribute lookup.
2. **Class list-based approach**: `element.classList.contains("order-edit__stage");` (Test Case 2)
	* Pros:
		+ Faster, as class list lookups are typically faster than attribute lookups.
	* Cons:
		+ Less explicit and less readable.

**Library Usage**

Neither of the test cases uses any external libraries. The `document.getElementById()` function is a built-in JavaScript method for accessing elements in the DOM.

**Special JS Features or Syntax**

There doesn't appear to be any special JavaScript features or syntax used in these test cases.

**Other Considerations**

* **DOM manipulation**: Both test cases manipulate the DOM by retrieving an element and then performing actions on it. This could potentially introduce overhead due to DOM operations.
* **Looping**: The while loop in both test cases runs 1000 times, which may not be representative of real-world usage patterns.

**Alternatives**

Other alternatives for benchmarking JavaScript performance might include:

1. **Mathematical expressions**: Using mathematical expressions or functions that are more likely to be executed repeatedly, such as `i++` or `Math.random()`.
2. **DOM manipulation with different element types**: Benchmarking performance using different HTML elements or attribute combinations.
3. **More complex algorithms**: Implementing and benchmarking more complex algorithms or data structures.

Keep in mind that the choice of test case will depend on the specific use case or application being tested.

Related benchmarks:

test speed (version: 0)

qwe

Comparing performance of: 1 vs 2

Created: 6 years ago by: Guest

Jump to the latest result

1

2

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):