Benchmark: ajquery es2021 - MeasureThat.net

Script Preparation code:

function $$(sel, el) {
  return (el || document).querySelectorAll(sel);
}

window.$$2 = (sel, el=document) => el.querySelectorAll(sel)

Tests:

$$
$$('body')
$$2
$$2('body')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
$$
$$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.

Let's break down the provided benchmark definition and test cases to understand what's being tested.

**Benchmark Definition**

The provided JSON represents a JavaScript microbenchmark that tests two different approaches to select elements from a document using the `querySelectorAll` method.

1. `$$(sel, el)`: This is a custom function that takes two arguments: `sel` (the selector string) and `el` (an optional element reference). If `el` is not provided, it defaults to the `document` object.
2. `window.$$2 = (sel, el=document) => el.querySelectorAll(sel)`: This is another custom function that does essentially the same thing as `$$(sel, el)`, but with a slightly different syntax.

**Test Cases**

There are two individual test cases:

1. `"Benchmark Definition": "$$('body')", "Test Name": "$$"`
	* This test case uses the `$$` function to select all elements from the `body` element.
2. `"Benchmark Definition": "$$2('body')", "Test Name": "$$2"`
	* This test case uses the custom function `window.$$2` to select all elements from the `body` element.

**Options Compared**

The two test cases compare the performance of using a custom function (`$$`) versus a built-in method (`querySelectorAll` with no wrapping function).

**Pros and Cons**

1. **Custom Function (`$$`)**:
	* Pros: May provide better readability and maintainability, as it clearly separates the selection logic from the rest of the code.
	* Cons: May introduce additional overhead due to the function call and potential optimizations in the browser engine.
2. **Built-in Method (`querySelectorAll`) with Wrapping Function**:
	* Pros: Likely to be more efficient, as the browser engine has already optimized this method for performance.
	* Cons: May make the code less readable and maintainable, if not clearly documented.

**Other Considerations**

Both test cases assume that the `querySelectorAll` method is supported by the browser engine. If the browser does not support this method, it may lead to unexpected behavior or errors.

In general, using a custom function like `$$(sel, el)` can be beneficial when:

* You need to perform complex or non-standard selections.
* You want to improve code readability and maintainability.

However, using the built-in `querySelectorAll` method with no wrapping function is generally preferred when:

* You want optimal performance.
* The browser engine has already optimized this method for your use case.

**Libraries and Special JS Features**

In this benchmark, there are no libraries or special JavaScript features being used. However, if a library like jQuery were being used, it would likely provide its own selection methods (`$$`) that could be tested in the benchmark.

Additionally, some modern JavaScript features like async/await, destructuring, or arrow functions might be present in the actual code, but they are not relevant to this specific benchmark.

Related benchmarks:

ajquery es2021 (version: 0)

Comparing performance of: $$ vs $$2

Created: 4 years ago by: Guest

Jump to the latest result

$$

$$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):