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JS find vs indexOf jigar
(version: 0)
JS find vs indexOf
Comparing performance of:
Array.find vs Array.indexOf
Created:
3 years ago
by:
Guest
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Script Preparation code:
var arr = []; var i = 0; while (i <= 1E5) arr[i] = i++;
Tests:
Array.find
const item = arr.find(item => item == 1E5);
Array.indexOf
const index = arr.indexOf(1E5); const data = arr[index]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Array.find
Array.indexOf
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 provided benchmark and explain what's being tested, compared, and their pros and cons. **Benchmark Overview** The benchmark compares two JavaScript methods for finding an element in an array: 1. `Array.find()` 2. `Array.indexOf()` These methods are part of the ECMAScript standard (ES) and are supported by most modern browsers. **What's being tested?** The test cases use the same array, `arr`, which is created with a large number of elements using a while loop (`i <= 1E5`). The array contains consecutive integers starting from 0. The goal is to find or index an element within this array. **Options Compared** Two methods are compared: A) **`Array.find()`**: This method returns the first element in the array that satisfies the provided condition. In this case, the condition is `item == 1E5`. B) **`Array.indexOf()`**: This method returns the index of the first occurrence of the specified value (in this case, `1E5`) within the array. **Pros and Cons** **`Array.find()`:** Pros: * More concise and expressive code * Can be more efficient for large arrays since it only iterates over the elements that satisfy the condition Cons: * May return `undefined` if no element satisfies the condition, whereas `indexOf()` will throw an error in this case * May have performance issues for very large arrays due to its iterator-based implementation **`Array.indexOf()`:** Pros: * More traditional and familiar API * Will not return `undefined`, but may throw an error if no element is found Cons: * Longer code snippet required, making it less concise * May be slower than `find()` for very large arrays due to its linear search approach **Library Used** None in this case. The test uses built-in JavaScript methods (`Array.find()` and `Array.indexOf()`). **Special JS Features or Syntax** No special features or syntax are used in the benchmark. **Other Alternatives** 1. **`Array.prototype.findIndex()`**: This method is similar to `find()`, but it returns -1 instead of `undefined` if no element satisfies the condition. 2. **`Array.prototype.lastIndexOf()`**: While not directly comparable, this method can be used as a fallback for finding the last occurrence of an element in the array. **Benchmark Preparation Code** The provided script preparation code creates an array with 100,000 elements using a while loop and assigns each integer value to the corresponding index. This is done to create a large dataset that can help measure performance differences between the two methods. By comparing these two JavaScript methods, MeasureThat.net aims to provide insights into their relative performance, efficiency, and ease of use in various scenarios.
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