Benchmark: jQuery eq vs access by index

HTML Preparation code:

<div id="testRoot">
  <span>1</span>
  <span>1</span>
  <span>1</span>
  <span>1</span>
  <span>1</span>
  <span>1</span>
  <span>1</span>
</div>

Script Preparation code:

var elements = $("#testRoot span");
var len = elements.length;

Tests:

Use eq
for (var i = 0; i < len; i++){ var t = elements.eq(i).textContent; }
Use get
for (var i = 0; i < len; i++){ var t = elements.get(i).textContent; }
Use array like access
for (var i = 0; i < len; i++){ var t = elements[i].textContent; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Use eq
Use get
Use array like access

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 8 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36

Browser/OS: Chrome 53 on Windows

View result in a separate tab

Test name	Executions per second
Use eq	72889.4 Ops/sec
Use get	144004.9 Ops/sec
Use array like access	139834.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript benchmarks.

**Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided benchmark compares three different approaches for accessing elements in a jQuery selection: `eq()`, `get()`, and array-like access (e.g., `[0]`).

**Benchmark Definition**

The benchmark definition json contains the following information:

* **Name**: "jQuery eq vs access by index"
* **Description**: A link to the jQuery documentation for `eq()` and `get()`
* **Script Preparation Code**: The code that sets up the variables used in the benchmark: `var elements = $( "#testRoot span"); var len = elements.length;`
* **Html Preparation Code**: The HTML code that generates the test data: a container element with six child spans.

**Individual Test Cases**

The individual test cases are defined as an array of objects, each containing:

* **Benchmark Definition**: A JavaScript code snippet that demonstrates one of the three approaches for accessing elements in the jQuery selection.
* **Test Name**: The name of the test case (e.g., "Use eq")

Here's a brief explanation of each test case:

1. **Use eq**: This test case uses the `eq()` method to access the text content of each element in the selection: `var t = elements.eq(i).textContent;`
2. **Use get**: This test case uses the `get()` method to access the text content of each element in the selection: `var t = elements.get(i).textContent;`
3. **Use array like access**: This test case uses array-like syntax (e.g., `[i]`) to access the text content of each element in the selection: `var t = elements[i].textContent;`

**Options Compared**

The three test cases compare different approaches for accessing elements in a jQuery selection:

1. **eq()**: The `eq()` method returns a jQuery object that represents the element at the specified index.
2. **get()**: The `get()` method returns an array of values from the selected elements.
3. **Array-like access**: This approach uses array indexing (e.g., `[i]`) to access the text content of each element in the selection.

**Pros and Cons**

Here are some pros and cons of each approach:

* **eq()**:
	+ Pros: Fast, efficient, and easy to use.
	+ Cons: May not work correctly if the selection is not a single element.
* **get()**:
	+ Pros: Returns an array of values, which can be useful for certain operations.
	+ Cons: May be slower than `eq()` due to the overhead of creating an array.
* **Array-like access**:
	+ Pros: Flexible and easy to use for accessing individual elements in a selection.
	+ Cons: May not work correctly if the selection is not a simple array.

**Library**

The benchmark uses jQuery, which is a popular JavaScript library for DOM manipulation and event handling. The `eq()` and `get()` methods are part of the jQuery API.

**Special JS Feature/Syntax**

There is no special JavaScript feature or syntax mentioned in this benchmark that requires specific knowledge of advanced concepts.

**Alternatives**

If you're interested in exploring alternative approaches to accessing elements in a jQuery selection, here are a few options:

* **QuerySelector**: A modern JavaScript API for selecting DOM elements based on CSS selectors.
* **Array.prototype.find()**: A method that returns the first element in an array that satisfies a given condition.
* **For...of loop**: A syntax sugar for iterating over arrays and other iterable objects.

Keep in mind that each approach has its own trade-offs, and the choice of which one to use depends on the specific requirements of your project.

Related benchmarks:

jQuery eq vs access by index (version: 3)

https://api.jquery.com/eq/ vs https://api.jquery.com/get/

Comparing performance of: Use eq vs Use get vs Use array like access

Created: 8 years ago by: Registered User

Jump to the latest result

Use eq

Use get

Use array like access

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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