Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
somevsfind
(version: 0)
Comparing performance of:
find vs some
Created:
6 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
window.myarray = new Array(50000).fill(0).map((v,i) => i);window.myarraylast = window.myarray[window.myarray.length-1]
Tests:
find
window.myarray.find(i => i == window.myarraylast)
some
window.myarray.some(i => i == window.myarraylast)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
find
some
Fastest:
N/A
Slowest:
N/A
Latest run results:
No previous run results
This benchmark does not have any results yet. Be the first one
to run it!
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON and explain what is being tested. **Benchmark Overview** MeasureThat.net provides a platform for users to create and run JavaScript microbenchmarks. The benchmark in question measures the performance of two different methods for finding a specific element in an array: `find` and `some`. **Script Preparation Code** The script preparation code creates an array `myarray` with 50,000 elements, all initialized to 0. The last element is then set to `window.myarraylast`. This setup is likely done to create a realistic scenario for benchmarking. ```javascript window.myarray = new Array(50000).fill(0).map((v,i) => i); window.myarraylast = window.myarray[window.myarray.length-1]; ``` **Html Preparation Code** There is no HTML preparation code provided, which means the benchmark only tests JavaScript execution performance and does not take into account any external factors like rendering or parsing. **Test Cases** The two test cases measure the performance of: 1. `find(i => i == window.myarraylast)`: This method finds the first index in the array that matches the last element (`window.myarraylast`). It uses an arrow function to define a predicate function. 2. `some(i => i == window.myarraylast)`: This method returns `true` as soon as it finds at least one element in the array that matches the last element. **Library and Library Purpose** The benchmark uses the `window.myarray` object, which is likely an example of a JavaScript array. The array is created using the `Array.prototype.fill()` and `Array.prototype.map()` methods. **Special JS Feature or Syntax** * Arrow functions (`i => i == window.myarraylast`) are used in both test cases. Arrow functions were introduced in ECMAScript 2015 (ES6) and provide a concise way to define small, single-purpose functions. * The use of `window` as the scope object is not specific to this benchmark, but it's worth noting that in modern JavaScript, it's generally recommended to use a more explicit scope or use `this` instead. **Pros and Cons of Different Approaches** 1. **Find**: This method has an average time complexity of O(n), where n is the length of the array. It may be faster for smaller arrays or when only one match is expected. * Pros: Generally faster, especially for small arrays or exact matches. * Cons: May be slower for larger arrays or when approximate matches are required. 2. **Some**: This method has a time complexity of O(n), but it's generally faster than `find` because it stops as soon as it finds the first match. * Pros: Faster in most cases, especially when only one match is expected. * Cons: May be slower for larger arrays or exact matches. **Other Considerations** When choosing between `find` and `some`, consider the following: * If you're sure there's only one match, `find` might be faster. However, if multiple matches are possible, `some` is generally a safer choice. * For very large arrays, `some` may still outperform `find` due to its ability to stop early. **Alternatives** Other methods for finding elements in an array include: 1. **IndexOf**: Introduced in ECMAScript 2015 (ES6), this method returns the index of the first occurrence of a value or -1 if it's not found. 2. **IndexOf()`: A method available on most JavaScript arrays, it returns the index of the first occurrence of a value or -1 if it's not found. However, `find` and `some` are still widely used and supported in modern JavaScript environments, so they should be considered when writing new code.
Related benchmarks:
Concat vs push(...) for large arrays of arrays
Concat vs push(...) vs flat for large arrays of arrays
Hashmap vs Array.Filter less
Array spread operator vs push, large list
Comments
Confirm delete:
Do you really want to delete benchmark?