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indexof_vs_find
(version: 0)
Comparing performance of:
IndexOf vs Find
Created:
5 years ago
by:
Guest
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Script Preparation code:
var data = [] for (let i = 0; i < 5000; ++i) data.push({ username: 'toto' }) data.push({ username: 'titi' }) for (let i = 0; i < 2500; ++i) data.push({ username: 'toto' })
Tests:
IndexOf
data.indexOf(e => e.username === 'titi')
Find
data.find(e => e.username === 'titi')
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
IndexOf
Find
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 break down the provided JSON data and explain what is being tested on MeasureThat.net. **Benchmark Definition:** The benchmark definition is a JSON object that contains two test cases: 1. `IndexOf`: This test case uses the `indexOf` method to search for an element in the `data` array. The method takes a callback function as its argument, which checks if the `username` property of each element matches the string `'titi'`. 2. `Find`: This test case uses the `find` method to search for an element in the `data` array. Like `IndexOf`, it also uses a callback function to check if the `username` property of each element matches the string `'titi'`. **Library and Purpose:** In both test cases, the `Array.prototype.indexOf` and `Array.prototype.find` methods are used. These methods belong to the built-in JavaScript Array prototype. * `indexOf` method: * Returns the index of the first occurrence of a specified value in an array. * If the value is not found, it returns -1. * Purpose: This method is useful for finding the position of a specific element within an array. * `find` method: * Executes a provided function once for each element in an array and returns the first element in which the function returns true. * If no elements match, it returns undefined. * Purpose: This method is useful when you need to find the first element that satisfies a certain condition. **Options Compared:** The benchmark compares the performance of two different methods: 1. `indexOf` 2. `find` These two methods differ in their approach and time complexity: * `indexOf` has an average time complexity of O(n), where n is the number of elements in the array. * `find` also has a time complexity of O(n) but is generally faster than `indexOf` for large arrays because it stops iterating as soon as it finds a match. **Pros and Cons:** * **IndexOf Method:** * Pros: * Generally slower than `find` * Can be beneficial in certain scenarios where the array size is small * Cons: * Slower for large arrays due to its linear search approach * **Find Method:** * Pros: * Faster than `indexOf` for large arrays * Stops iterating as soon as it finds a match, which can improve performance * Cons: * May return undefined if no elements match the condition **Other Considerations:** * The benchmark is performed on a Windows 10 machine with Firefox 91 browser. * The dataset consists of 7,500 elements (5,000 "toto" and 2,500 "titi"). If you were to rewrite this benchmark or create similar benchmarks in the future, consider using: * `for...of` loops instead of traditional `for` loops for better performance. * Using modern JavaScript features like async/await and Web Workers to optimize computations. In terms of alternatives, other methods like `some()` or `every()` could also be compared in a similar benchmark. However, their use cases and performance characteristics make them less suitable for this particular scenario.
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