Benchmark: array[1] vs array.at(1) 2

Script Preparation code:

var array = [1,2,3];

Tests:

array[1]
var d = array[1];
array.at(1)
var z = array.at(1);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
array[1]
array.at(1)

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36

Browser/OS: Chrome 116 on Windows

View result in a separate tab

Test name	Executions per second
array[1]	17697324.0 Ops/sec
array.at(1)	17799052.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**Benchmark Overview**

The test compares two ways to access the second element of an array: using the bracket notation (`array[1]`) and using the `at()` method.

**Options Compared**

There are two options being compared:

1. **Array Bracket Notation**: This is a traditional way to access array elements by specifying their index. In this case, `array[1]` accesses the second element of the `array`.
2. **Array `at()` Method**: Introduced in ECMAScript 2019 (ES9), the `at()` method provides a more efficient and expressive way to access array elements by providing an optional offset value.

**Pros and Cons**

**Array Bracket Notation**

Pros:

* Widely supported across older browsers and JavaScript engines.
* Easy to understand and implement for developers familiar with array indexing.

Cons:

* Can be slower due to the need to parse the expression and execute the code sequentially.

**Array `at()` Method**

Pros:

* More expressive and readable than traditional bracket notation.
* Optimized by modern JavaScript engines, making it faster and more efficient.

Cons:

* Requires support for ES9 or later, which might not be present in older browsers or JavaScript engines.

**Library Usage**

The test case uses the `array` variable, which is assumed to be an array object. This suggests that the benchmark is testing the performance of accessing array elements using different methods.

**Special JS Feature/Syntax**

There are no special features or syntax being tested in this benchmark. The focus is solely on comparing two approaches to access array elements.

**Alternatives**

If you wanted to test other ways to access array elements, some alternatives could include:

* Using `array[0]` and accessing the first element directly.
* Using a loop to iterate over the array and retrieve the desired element.
* Using a library like Lodash or Underscore.js, which provide various utility functions for working with arrays.

Keep in mind that these alternatives might not be as straightforward or efficient as using the `at()` method.

**Benchmark Preparation Code**

The preparation code is provided:
```javascript
var array = [1, 2, 3];
```
This creates an example array with three elements.

**Individual Test Cases**

The test cases are defined in two separate benchmark definitions:

* `array[1]`: Tests accessing the second element of the `array` using traditional bracket notation.
* `array.at(1)`: Tests accessing the second element of the `array` using the `at()` method.

These test cases provide a way to measure the performance difference between these two approaches.

Related benchmarks:

array[1] vs array.at(1) 2 (version: 0)

Comparing performance of: array[1] vs array.at(1)

Created: one year ago by: Guest

Jump to the latest result

array[1]

array.at(1)

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):