Benchmark: array length vs some

HTML Preparation code:

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.core.js"></script>

Tests:

array find
var a = ['hello', 'a', 'bc', 'cd', 'ef', 'gt']; var b = a.filter(item => item === 'bc').length !== 0;
array some
var a = ['hello', 'a', 'bc', 'cd', 'ef', 'gt']; var b = a.some(item => item === 'bc');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
array find
array some

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser/OS: Chrome 134 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
array find	30984960.0 Ops/sec
array some	66677820.0 Ops/sec

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks, comparing different approaches to specific tasks. In this case, we have a benchmark that compares the performance of two methods: `filter()` and `some()` on an array of strings.

The benchmark definition json contains the following information:

* **Name**: The name of the benchmark, which is "array length vs some".
* **Description**: A brief description of the benchmark, explaining that it compares the new ES6 spread operator with the traditional `concat()` method.
* **Script Preparation Code**: An empty string, indicating that no script-specific code needs to be executed before running the benchmark.
* **Html Preparation Code**: A link to a JavaScript library, Lodash, which is used in the individual test cases.

**Individual Test Cases**

The benchmark consists of two test cases:

1. **array find**
	* The `Benchmark Definition` specifies a script that creates an array `a` with six elements and then checks if the length of the filtered array (created using `filter()` with a callback function) is not zero.
2. **array some**
	* The `Benchmark Definition` specifies a script that creates an array `a` with six elements and then checks if any element in the array (using `some()`) matches a specific condition.

**Options Compared**

The benchmark compares the performance of two approaches:

1. `filter()` (used in the "array find" test case)
2. `some()` (used in the "array some" test case)

Both methods are used to check for the presence of an element that meets a certain condition in the array.

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

* **filter()**:
	+ Pros: More explicit, easier to understand, and allows for more control over the filtering process.
	+ Cons: Can be slower than `some()` because it requires iterating through all elements in the array.
* **some()**:
	+ Pros: Faster than `filter()` because it stops iterating as soon as it finds a matching element.
	+ Cons: Less explicit and less intuitive, making it harder to understand for some developers.

**Library: Lodash**

The benchmark uses the Lodash library, which provides a `lodash.core.js` file that is included in the HTML preparation code. The specific functions used are:

* `filter()`: a built-in JavaScript function that creates a new array with elements from an original array that pass a test provided by a callback function.
* `some()`: a built-in JavaScript function that returns true if at least one element of the array passes a test provided by a callback function.

**Special JS Feature/Syntax**

There is no special JavaScript feature or syntax used in this benchmark. The benchmark only focuses on comparing two standard JavaScript functions: `filter()` and `some()`.

**Alternatives**

If you need to optimize arrays, here are some alternative approaches:

* **Array.prototype.every()**: Similar to `filter()`, but returns true if all elements pass a test provided by a callback function.
* **Array.prototype.includes()`: Returns true if an element is found in the array using a predicate function.
* **Array.prototype.findIndex()`: Returns the index of the first element that satisfies a condition, or -1 if no such element exists.

Note that these alternatives may have different performance characteristics and use cases compared to `filter()` and `some()`.

Related benchmarks:

array length vs some (version: 0)

Compare the new ES6 spread operator with the traditional concat() method

Comparing performance of: array find vs array some

Created: 3 years ago by: Guest

Jump to the latest result

array find

array some

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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