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Comparing findIndex with map & indexOf
(version: 0)
Comparing performance of:
findIndex vs map & indexOf
Created:
3 years ago
by:
Registered User
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Script Preparation code:
var arr = new Array(15000); arr.fill({ id: 0 }); arr = arr.map((el, idx) => el.id = idx); var foo = Math.floor(Math.random() * 15000);
Tests:
findIndex
var index = arr.findIndex(el => el.id == foo);
map & indexOf
var index = arr.map(el => el.id).indexOf(foo)
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
findIndex
map & indexOf
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Benchmark Explanation** The provided JSON represents a JavaScript microbenchmark test case, where two different approaches are compared: using the `findIndex` method and using the `map` function in combination with the `indexOf` method. **Approach 1: Using `findIndex`** The first approach uses the `findIndex` method to find the index of an element in the array that matches a specific value (`foo`). The `findIndex` method returns the index of the first element in the array that satisfies the provided condition, or -1 if no element is found. **Approach 2: Using `map` and `indexOf`** The second approach uses the `map` function to create a new array with the `id` property of each element, and then uses the `indexOf` method to find the index of the value (`foo`) in the resulting array. This approach creates an intermediate array and searches for the value in that array. **Comparison** The main difference between these two approaches is how they handle the search operation: * `findIndex`: Directly searches for the value in the original array, which may lead to better performance if the value is already present. * `map` and `indexOf`: Creates an intermediate array with the transformed values, which can be slower due to the additional memory allocation. **Pros and Cons** * **FindIndex**: Pros: + Faster search time since it only needs to scan the original array once. + No unnecessary memory allocation. Cons: + May not work correctly if the value is not present in the array. * **Map & IndexOf**: Pros: + Can be more predictable and robust, especially when dealing with large datasets or complex conditions. Cons: + Requires additional memory allocation for the intermediate array. + Slower search time due to the extra step of searching for the value. **Library Used** None explicitly mentioned in this benchmark. However, it's worth noting that JavaScript arrays use a few internal libraries and algorithms under the hood, but they are not typically exposed directly. **Special JS Feature or Syntax** This benchmark does not utilize any special JavaScript features or syntax beyond standard ECMAScript (ES) 2015+ features. **Other Alternatives** If you need to find an element in an array that matches a specific value, other approaches could include: * Using the `includes` method: `arr.includes(foo)` * Looping through the array manually using a traditional for loop * Using a library like Lodash's `findIndex` or `indexOf` * Using a different data structure, such as a Set, if you need fast lookups and the values are hashable.
Related benchmarks:
findIndex vs map & indexOf
findIndex vs indexOf - JavaScript performance
findIndex vs map & indexOf vs find
findIndex vs IndexOf + map
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