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array for vs some (test)
(version: 0)
Benchmark.js
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
array for vs array some
Created:
2 years ago
by:
Guest
Go to the latest result
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 for
var a = ['hello', 'a', 'bc']; function find(target, arr) { for (let i = 0; i < arr.length; i++) { if (target === arr[i]) return true; } return false; } var b = find('bc', a);
array some
var a = ['hello', 'a', 'bc']; var b = a.some(item => item === 'bc');
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
array for
array some
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Mobile Safari/537.36
Browser/OS:
Chrome Mobile 119 on Android
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=487262" width="100%" height="500px"></iframe>
array some
153.8M/s
array for
113.2M/s
View exact numbers
Test name
Executions per second
✓
array some
153,785,904 Ops/sec
array for
113,220,272 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark and its test cases. **What is being tested?** The benchmark compares two ways to check if an element exists in an array: using the traditional `concat()` method with a loop (also known as "array for") and the new ES6 spread operator (`...`) with the `some()` method. **Options compared** There are two options being compared: 1. **Array For**: This option uses a traditional loop to iterate through the elements of the array and checks if the target element is present. 2. **Some Method**: This option uses the `some()` method, which returns a boolean value indicating whether at least one element in the array satisfies the provided condition. **Pros and Cons** **Array For:** Pros: * Well-known and widely supported * Can be more intuitive for developers familiar with traditional loops Cons: * Can be slower due to the overhead of creating a new array using `concat()` * May not perform as well on large arrays **Some Method:** Pros: * Faster and more efficient, especially for large arrays * More concise and readable code * Returns a boolean value directly, eliminating the need for an additional check Cons: * Requires support for the modern ES6 syntax * May be less familiar to developers who are not used to this syntax **Library: Lodash** The benchmark uses the Lodash library, which provides the `some()` method. Lodash is a popular utility library that provides a set of functional programming helpers, including the `some()` method. **Special JS feature or syntax** None mentioned in the provided code snippet. However, if we were to consider other test cases, we might see special features like: * Async/await syntax * Promises * Arrow functions * Object destructuring However, this is not the case for the provided benchmark code. **Other alternatives** If you want to compare these two options in a more comprehensive way, you could also consider using other methods, such as: * Using `indexOf()` or `includes()`, which are built-in array methods that can be used to check if an element exists. * Using a library like Fast.js or MicroBenchmark, which provide more advanced benchmarking tools and features. For example, the test case for "array for" could use the following code: ```javascript var b = arr.indexOf('bc') !== -1; ``` Or the test case for "some method" could use the following code: ```javascript var b = [...arr].includes('bc'); ``` These alternatives would require additional setup and configuration, but they provide more comprehensive comparisons of the performance characteristics of these two options.
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