Benchmark: indexOf: >= 0 or !== -1

Script Preparation code:

var test = ['item'];

Tests:

>= 0
if(test.indexOf('something') >= 0) { // Fount item }
!== -1
if(test.indexOf('something') !== -1) { // Fount item }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
>= 0
!== -1

Fastest: N/A

Slowest: N/A

Latest run results:

No previous 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 and explain what's being tested.

**Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided benchmark is for two test cases, both of which check if an element exists in an array using the `indexOf` method.

**Benchmark Definition**

The Benchmark Definition json represents the overall configuration for the benchmark:
```json
{
    "Name": "indexOf: >= 0 or !== -1",
    "Description": null,
    "Script Preparation Code": "var test = ['item'];",
    "Html Preparation Code": null
}
```
Here, we have:

* `Name`: The name of the benchmark.
* `Description`: An empty description for the benchmark (not specified).
* `Script Preparation Code`: A JavaScript code snippet that initializes an array `test` with a single element `'item'`.
* `Html Preparation Code`: An empty HTML code snippet (not needed in this case).

**Individual Test Cases**

The benchmark consists of two individual test cases:
```json
[
    {
        "Benchmark Definition": "if(test.indexOf('something') >= 0)\r\n{\r\n // Fount item \r\n}",
        "Test Name": ">= 0"
    },
    {
        "Benchmark Definition": "if(test.indexOf('something') !== -1)\r\n{\r\n // Fount item \r\n}",
        "Test Name": "!== -1"
    }
]
```
Each test case has:

* `Benchmark Definition`: A JavaScript code snippet that checks if the element `'something'` exists in the array `test` using the `indexOf` method.
* `Test Name`: The name of each test case.

**Options Being Compared**

The two test cases compare different options for checking if an element exists in an array:

1. **>= 0**: This option checks if the index is greater than or equal to 0, effectively checking if the element is found at a valid position in the array.
2. **!== -1**: This option checks if the index is not equal to -1, which is the special value returned by `indexOf` when the element is not found.

**Pros and Cons of Each Approach**

Here's a brief summary of each approach:

* **>= 0**:
	+ Pros: More accurate results, as it accounts for arrays with gaps or holes.
	+ Cons: May be slower due to more complex checks.
* **!== -1**:
	+ Pros: Faster and simpler to implement, as it only needs to check for a specific value (-1).
	+ Cons: Less accurate results, as it doesn't account for arrays with gaps or holes.

**Library Used**

None is explicitly mentioned in the provided Benchmark Definition. However, it's worth noting that `indexOf` is a built-in JavaScript method that searches for an element in an array and returns its index.

**Special JS Feature/Syntax**

There is no special JavaScript feature or syntax used in this benchmark. The code snippets use standard JavaScript syntax and do not employ any advanced features like async/await, generators, or decorators.

**Alternatives**

If you wanted to test similar benchmarks, you could consider the following alternatives:

* Use a different method for checking if an element exists in an array, such as `includes()` (introduced in ECMAScript 2015).
* Test the performance of arrays with different sizes and data distributions.
* Compare the performance of different JavaScript engines or runtime environments.

Keep in mind that these alternatives would require modifications to the Benchmark Definition and test cases to accommodate the new approach.

Related benchmarks:

indexOf: >= 0 or !== -1 (version: 0)

Comparing performance of: >= 0 vs !== -1

Created: 3 years ago by: Registered User

Jump to the latest result

>= 0

!== -1

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):