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for vs Array.find
(version: 0)
Benchmark.js
Native JS for loop vs Array.find
Comparing performance of:
Array.find vs Native for loop
Created:
6 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var arr = [...Array(10000).keys()];
Tests:
Array.find
var b = arr.find(item => item === 5555);
Native for loop
for (var i = 0; i < arr.length; i++) { if (arr[i] === 5555) { return; } }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Array.find
Native for loop
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
one year ago
)
User agent:
Mozilla/5.0 (Linux; arm_64; Android 11; Redmi Note 9S) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.6834.2144 YaApp_Android/25.20.1 YaSearchBrowser/25.20.1 BroPP/1.0 SA/3 Mobile Safari/537.36
Browser/OS:
Chrome 132 on Android 25.20.1
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=601139" width="100%" height="500px"></iframe>
Array.find
33K/s
Native for loop
31K/s
View exact numbers
Test name
Executions per second
✓
Array.find
32,716 Ops/sec
Native for loop
31,197 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark and its test cases. **What is being tested?** The provided JSON represents two test cases that compare the performance of native JavaScript for loops versus `Array.find` (a built-in array method introduced in ECMAScript 2015). In essence, these tests measure how fast each approach can find a specific element within an array. The first test case uses a native for loop to iterate through the array and find the desired value. The second test case uses the `Array.find` method with a callback function to achieve the same result. **Options compared** The two options being compared are: 1. **Native JavaScript for loop**: A traditional loop that manually iterates through each element of the array using an index (`i`) and checks if the current element matches the target value. 2. **Array.find method**: A built-in array method that takes a callback function as an argument, allowing you to specify a condition that must be met for each element in the array. **Pros and cons of each approach** **Native JavaScript for loop:** Pros: * More control over iteration (e.g., skipping elements or iterating backwards). * No reliance on built-in methods that might introduce overhead. * Can be optimized further with techniques like caching or tail recursion. Cons: * More verbose code, especially for large arrays or complex conditions. * Error-prone if not implemented correctly (e.g., index out-of-bounds issues). **Array.find method:** Pros: * Concise and readable code. * Eliminates the need to manually iterate through each element. * Less error-prone compared to traditional loops. Cons: * Introduces additional overhead due to the built-in method call and potential implementation optimizations. * May not perform as well for very large arrays or complex conditions. **Library usage** There are no explicit libraries mentioned in the provided code. However, it's worth noting that `Array.find` is a standard method introduced in ECMAScript 2015, which means all modern JavaScript engines (including those used by browsers like Chrome) support it out-of-the-box. **Special JS features or syntax** The benchmark uses: 1. **Template literals**: The "var b = arr.find(item => item === 5555);" line uses a template literal to define the callback function for `Array.find`. This feature was introduced in ECMAScript 2015 as well. 2. **Arrow functions**: The same line also uses an arrow function (`item => item === 5555`) instead of a traditional function declaration. While not unique to this benchmark, it's worth noting that arrow functions are a common pattern in modern JavaScript. **Alternatives** Other alternatives for finding a specific element within an array could include: 1. **Using `some()` method**: Instead of `find()`, you can use the `some()` method with a callback function to find the first element that meets the condition. 2. **Manual iteration using `indexOf()`**: You can manually iterate through each element in the array using the `indexOf()` method, which returns the index of the first occurrence of the target value. Keep in mind that these alternatives may have different performance characteristics and trade-offs compared to the native for loop and `Array.find` methods.
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