Benchmark: 213find vs findIndex vs some (Array prototype methods)

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Tests:

test
const arr = ['1','2'] arr.at(0)
test2
const arr = ['1','2'] arr[0]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
test
test2

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
test	132369168.0 Ops/sec
test2	133503472.0 Ops/sec

Autogenerated LLM Summary (model gpt-4o-mini, generated 4 months ago):

LLMs can make mistakes. Check important info.

The benchmark described compares two different methods of accessing elements in an array using JavaScript. Specifically, it evaluates the performance of the `Array.prototype.at()` method against the traditional array index access.

### Benchmark Components

1. **Benchmark Name**: The name of the benchmark is "213find vs findIndex vs some (Array prototype methods)", though the actual tests here focus solely on array access methods: `arr.at(0)` versus `arr[0]`.

2. **Test Cases**:
    - **Test Name: test**  
      **Benchmark Definition**: `const arr = ['1','2']; arr.at(0);`  
      This test uses the `at(index)` method to retrieve the first element of the array.
      
    - **Test Name: test2**  
      **Benchmark Definition**: `const arr = ['1','2']; arr[0];`  
      This test uses the traditional bracket notation to access the first element in the same array.

### Comparison of Options

- **`arr.at(0)`**:
  - **Pros**: 
    - The `at()` method allows for more intuitive negative indexing, which can retrieve elements from the end of the array, e.g., `arr.at(-1)` gives the last element.
    - It also has better semantic readability in some contexts where positional access is emphasized.
  - **Cons**: 
    - Performance overhead might be present due to the method call, as it is a function invocation.
    - As this is a newer addition to JavaScript, it might not be fully optimized in all engines or older browsers.
  
- **`arr[0]`**:
  - **Pros**: 
    - This method is a direct access operation, which generally performs faster as it does not involve any function call overhead.
    - It has been part of JavaScript since its inception, so it is widely supported and extremely well optimized across different JavaScript engines.
  - **Cons**: 
    - Bracket notation does not support negative indexing, which can limit some use cases, particularly when working with arrays where the length is not known in advance.

### Benchmark Results

The results from the benchmark indicate the following performance:

- **Test Name: test2 (`arr[0]`)**
  - Executions per second: 133,503,472.0
- **Test Name: test (`arr.at(0)`)**
  - Executions per second: 132,369,168.0

From the results, accessing an array element using bracket notation (`arr[0]`) is slightly faster than using the `arr.at(0)` method, though both methods perform exceptionally well.

### Other Considerations

To fully take advantage of array access performance, developers should consider the context of their code. Using index access can be beneficial in performance-critical sections of code where speed is paramount. If the code involves negative indexing or needs more expressive methods, then using `at()` might justify its overhead despite the slight performance cost.

### Alternatives to Consider

While this benchmark focused on the performance of the two vs. each other, there are other approaches to accessing array elements:
- **For Loops**: Using traditional `for` loops or modern `forEach` methods can also access elements if needed for iterations.
- **Higher-Order Functions**: Array methods like `map`, `filter`, or `reduce` can manipulate and access elements based on conditions or transformation rules, although they may introduce overhead compared to direct access methods.

In conclusion, when choosing between these two methods for array access, developers should weigh the advantages of readability and additional capabilities (like negative indexing with `at()`) against the slightly better performance of using bracket notation (`[]`). Consideration of the specific use case and context will be crucial in making the best choice.

Related benchmarks:

213find vs findIndex vs some (Array prototype methods) (version: 1)

Comparing performance of: test vs test2

Created: 4 months ago by: Guest

Jump to the latest result

test

test2

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated 4 months ago):