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_.findIndex vs. array.findIndex
(version: 0)
Comparing performance of:
_.findIndex vs array.findIndex
Created:
5 years ago
by:
Guest
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HTML Preparation code:
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.min.js"></script>
Script Preparation code:
var elements = ['a', 'b', 'c']
Tests:
_.findIndex
_.findIndex(elements, e => e === 'b')
array.findIndex
elements.findIndex(e => e === 'b')
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
_.findIndex
array.findIndex
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark and explain what's being tested. **Benchmark Description** The website `MeasureThat.net` is used to create and run JavaScript microbenchmarks. The provided JSON represents a benchmark that compares two methods for finding an index in an array: `_findIndex` from Lodash (a utility library) and `array.findIndex`. **What are we testing?** We're testing the performance of these two approaches: 1. **_.findIndex(elements, e => e === 'b')**: This is the `_findIndex` method from Lodash, which takes an array (`elements`) and a callback function (`e => e === 'b'`) as arguments. The callback function is expected to return `true` if the element at index `e` in the array matches `'b'`, and `false` otherwise. 2. **elements.findIndex(e => e === 'b')**: This is the native `findIndex` method on arrays, which also takes a callback function (`e => e === 'b'`) as an argument. **Pros and Cons of each approach:** 1. **_.findIndex(elements, e => e === 'b')**: * Pros: + Often more readable and maintainable code for simple use cases. + Lodash provides additional functionality and utility methods that might be useful in other parts of the codebase. * Cons: + Adds an extra dependency on the Lodash library, which can increase download size and potential conflicts with other libraries. 2. **elements.findIndex(e => e === 'b')**: * Pros: + No additional dependencies or overhead. + Native method implementation is typically optimized for performance. * Cons: + Might be less readable for complex use cases, as the callback function can become nested and difficult to understand. **Library: Lodash** Lodash is a popular utility library that provides a wide range of functions and methods for working with arrays, objects, and other data structures. The `_findIndex` method is one of its many useful tools for manipulating arrays in functional programming styles. In this benchmark, we're using Lodash to test the performance of `_.findIndex`, while comparing it to the native implementation on arrays. **Special JS feature: None** There are no special JavaScript features or syntax used in this benchmark that would require additional explanation beyond the standard usage of arrays and callback functions. **Other alternatives:** If you needed to find an index in an array, there are other approaches you could take: 1. **Using a for loop**: You can use a traditional `for` loop to iterate over the elements of the array and check each one until you find the match. 2. **Using Array.prototype.reduce()**: You can use `Array.prototype.reduce()` to accumulate an index value that increments with each iteration, stopping when the condition is met. These alternatives would likely have different performance characteristics compared to the native `findIndex` method or Lodash's `_findIndex` method. However, they might be more suitable for specific use cases where readability and maintainability are prioritized over raw performance.
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