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Number array indexOf vs includes vs some
(version: 0)
performance comparison of ways to find if an array contains a value
Comparing performance of:
IndexOf vs Includes vs some
Created:
4 years ago
by:
Guest
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HTML Preparation code:
<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
Script Preparation code:
var array = [1, 2, 3]
Tests:
IndexOf
array.indexOf(3) !== 1
Includes
array.includes(3)
some
array.some(v => v == 3)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
IndexOf
Includes
some
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the provided benchmark definition and test cases. **Benchmark Definition** The benchmark definition json represents a comparison of three different approaches to find if an array contains a specific value: `indexOf`, `includes`, and `some`. The benchmark measures the performance of these approaches in JavaScript, which is used as the programming language for the test. **Approaches Compared** 1. **`array.indexOf(3) !== 1`**: This approach uses the `indexOf` method to find the index of a specific value (3) in the array. If the value is not found at the expected position (index 1), it returns -1, which is considered "not equal" to 1. 2. **`array.includes(3)`**: This approach uses the `includes` method to check if a specific value (3) is present in the array. 3. **`array.some(v => v == 3)`**: This approach uses the `some` method with an arrow function that checks if each element of the array is equal to 3. **Pros and Cons of Each Approach** 1. **`indexOf`**: * Pros: Fast and efficient, as it only iterates through a limited range of elements. * Cons: May not be suitable for large arrays or when the value is not present in the first few elements. 2. **`includes`**: * Pros: More concise and readable than `indexOf`, with better performance on modern browsers. * Cons: May use more memory, as it needs to create an iterator over the array. 3. **`some`**: * Pros: More flexible and expressive, allowing for early termination if a match is found. * Cons: May be slower than `indexOf` or `includes`, especially for large arrays. **Library Usage** The benchmark uses Lodash, a popular JavaScript library that provides various utility functions. In this case, the `lodash.min.js` file is included in the HTML preparation code to provide the `includes` method implementation. **Special JS Features or Syntax** None of the test cases use any special JavaScript features or syntax beyond what's standard for modern browsers. **Alternatives** If you're interested in exploring alternative approaches, here are a few options: 1. **Manual iteration**: Use a loop to iterate through the array and check each element manually. 2. **Regular expressions**: Use regular expressions to search for the value in the array. 3. **Native methods**: Use native JavaScript methods like `find()` or `forEach()` instead of `indexOf`, `includes`, or `some`. Keep in mind that these alternatives may have different performance characteristics and might not be as concise or readable as the original approaches. I hope this explanation helps you understand the benchmark definition and test cases!
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