Benchmark: Array find with indexOf vs includes

Script Preparation code:

var arr = [...Array(1000)].fill(0).map((_, i) => i);

Tests:

indexOf
var found = arr.indexOf(990) > -1;
includes
var found = arr.includes(990);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
indexOf
includes

Fastest: N/A

Slowest: N/A

Latest run results:

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

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

**Benchmark Definition**

The benchmark definition is represented by two test cases:

1. `Array find with indexOf`: This test case checks the performance of the `indexOf` method in JavaScript arrays.
2. `Array find with includes`: This test case checks the performance of the `includes` method in JavaScript arrays.

**Options Compared**

In both test cases, the following options are compared:

* **`arr.indexOf(990)`**: This option uses the traditional `indexOf` method to search for a specific value (in this case, 990) within an array.
* **`arr.includes(990)`**: This option uses the newer `includes` method to check if an array contains a specific value.

**Pros and Cons of Different Approaches**

1. **Traditional `indexOf`**:
	* Pros: Widely supported across browsers and environments, easy to implement.
	* Cons: Can be slower than the new `includes` method due to its linear search algorithm.
2. **New `includes` method**:
	* Pros: Faster than traditional `indexOf`, more concise syntax, and widely adopted by modern browsers.
	* Cons: May not work in older browsers or environments that don't support it.

**Library Usage**

There is no explicit library usage mentioned in the benchmark definition. However, the `Array.prototype.indexOf` method is used in both test cases, which is a built-in JavaScript method.

**Special JS Features or Syntax**

The new `includes` method is a feature introduced in ECMAScript 2019 (ES2020). It provides a more concise way to check if an array contains a specific value. The benchmark definition uses this method to compare its performance with the traditional `indexOf` method.

**Other Considerations**

When choosing between the traditional `indexOf` and the new `includes` methods, consider the following factors:

* Browser support: If you need to support older browsers that don't adopt modern JavaScript features, use traditional `indexOf`.
* Performance: The new `includes` method is generally faster than traditional `indexOf`, but this can vary depending on your specific use case.
* Code readability and conciseness: The new `includes` method provides a more concise syntax, making it easier to write readable code.

**Alternative Approaches**

If you need to compare performance between different search methods or want to test other array-related operations (like `some`, `every`, `find`, etc.), consider the following alternatives:

* Use a testing framework like Jest or Mocha to create and run your own benchmark tests.
* Utilize JavaScript testing libraries like Benchmark.js or js-benchmark to compare performance of different code snippets.
* Experiment with different browser engines, like WebKit or Blink, to explore variations in performance.

I hope this explanation helps you understand the provided benchmark!

Related benchmarks:

Array find with indexOf vs includes (version: 0)

Comparing performance of: indexOf vs includes

Created: 4 years ago by: Guest

Jump to the latest result

indexOf

includes

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):