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Indexof vs Includes in an array
(version: 0)
Comparing performance of:
Includes vs IndexOf
Created:
2 years ago
by:
Guest
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Script Preparation code:
const arr = [1,2,4,5,6,,7,8,4,6,,7,89,0,7,1,3,5,7,9,0,5,3,1,4,6,8,9,1,5,6,8,9,2,5,5,2,3,22]
Tests:
Includes
const arr = [1,2,4,5,6,,7,8,4,6,,7,89,0,7,1,3,5,7,9,0,5,3,1,4,6,8,9,1,5,6,8,9,2,5,5,2,3,22] arr.includes(22)
IndexOf
const arr = [1,2,4,5,6,,7,8,4,6,,7,89,0,7,1,3,5,7,9,0,5,3,1,4,6,8,9,1,5,6,8,9,2,5,5,2,3,22] arr.indexOf(22)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Includes
IndexOf
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks! **Benchmark Definition** The provided JSON defines two benchmarking tests: `Indexof vs Includes in an array`. The script preparation code for both tests is identical, but with different methods to search for a specific value (22) within the array. Here's what's being tested: * Two methods to search for a value in an array: + `includes()`: checks if a value exists anywhere in the array. + `indexOf()`: returns the index of the first occurrence of the value in the array. If not found, it returns -1. **Options Compared** The two tests compare the performance of these two methods: * `includes()` vs `indexOf()` **Pros and Cons** Here's a brief analysis of each approach: ### `includes()` Pros: * Easier to use, as it only needs to check if the value exists anywhere in the array. * Can be more efficient than `indexOf()` when the value is not present in the array. Cons: * May require more iterations over the array, which can lead to slower performance for large arrays. * Less control over the search process, as it returns a boolean result instead of an index. ### `indexOf()` Pros: * Returns the exact index of the first occurrence of the value, making it useful for indexing and caching purposes. * Can be more efficient than `includes()` when the value is present in the array, as it can stop searching once it finds the match. Cons: * Requires the value to exist in the array, which can lead to slower performance if the value is not found. * Returns -1 if the value is not found, which might be considered a false negative result. **Library and Special JS Features** Neither of the tests uses any external libraries. However, it's worth noting that `includes()` was introduced in ECMAScript 2019 (ES2020) as a more modern alternative to `indexOf()`. **Other Considerations** When comparing performance, it's essential to consider other factors, such as: * Array size: Larger arrays may lead to slower performance for both methods. * Value presence: If the value is not present in the array, `includes()` might be faster than `indexOf()`. * Browser/Platform: Different browsers and platforms may have varying optimizations for these methods. **Alternatives** If you're interested in exploring alternative search methods or optimizing the existing ones, consider: * Using a library like Lodash's `isIn()` function, which provides a more robust and flexible search mechanism. * Implementing a custom binary search algorithm, which can be faster than the standard `includes()` and `indexOf()` methods for large arrays. * Investigating native web worker optimizations or parallel processing techniques to further improve performance. Keep in mind that benchmarking is an iterative process. You may need to experiment with different approaches and optimize accordingly based on your specific use case and performance requirements.
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