Benchmark: JS indexOf vs some

Script Preparation code:

var arr = ['a','b','c'];

Tests:

indexOf result
const indexOfRes = arr.indexOf('b') > -1;
some Result
const someRes = arr.some(e => e === 'b');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
indexOf result
some Result

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 5 months ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:145.0) Gecko/20100101 Firefox/145.0

Browser/OS: Firefox 145 on Linux

View result in a separate tab

Test name	Executions per second
indexOf result	45951340.0 Ops/sec
some Result	74097360.0 Ops/sec

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The MeasureThat.net benchmark measures the performance of two JavaScript functions: `indexOf` and `some`. These functions are used to check if an element exists in an array or not.

**Functions Being Tested**

1. **`indexOf`**: The `indexOf` function returns the index of the first occurrence of a specified value within an array, or -1 if the value is not found.
2. **`some`**: The `some` function returns `true` as soon as it finds an element in the array that satisfies the provided condition, and `false` after checking all elements.

**Options Being Compared**

In this benchmark, two options are being compared:

* **`indexOf`**: This option uses the traditional `indexOf` method to find the index of a specific value in the array.
* **`some`**: This option uses the `some` function with a callback function that checks if each element in the array is equal to `'b'`.

**Pros and Cons of Each Approach**

1. **`indexOf`**:
	* Pros: Simple and straightforward implementation, easy to understand and maintain.
	* Cons: May perform poorly for large arrays or when searching for elements not present in the array.
2. **`some`**:
	* Pros: More efficient than `indexOf` for large arrays, as it stops checking as soon as it finds a match.
	* Cons: Requires an additional callback function, which may add complexity to code.

**Other Considerations**

* The benchmark uses a small test array with only three elements (`['a', 'b', 'c']`) to minimize the impact of any overhead or initialization costs.
* The `some` option uses a callback function that directly compares each element to `'b'`, which may be less efficient than using a more complex condition.

**Library Used**

None. The benchmark only uses built-in JavaScript functions (`indexOf` and `some`).

**Special JS Feature or Syntax**

None mentioned.

**Alternatives**

Other alternatives for implementing the `indexOf` and `some` functions could include:

* Using `findIndex` instead of `indexOf`: This function returns the index of the first occurrence of a specified value, but it may perform poorly if the array is very large.
* Using a custom implementation with a more efficient algorithm: For example, using a binary search approach to find the index of an element in an array.

However, these alternatives are not being tested in this benchmark, and the results may vary depending on the specific use case and requirements.

Related benchmarks:

JS indexOf vs some (version: 0)

Comparing performance of: indexOf result vs some Result

Created: 3 years ago by: Guest

Jump to the latest result

indexOf result

some Result

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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