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Lodash _.first vs array first
(version: 0)
Comparing performance of:
_.first vs array first
Created:
7 years ago
by:
Guest
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HTML Preparation code:
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.core.js"></script>
Script Preparation code:
var names = ["first", "middle", "last", "suffix"];
Tests:
_.first
const firstName = _.first(names)
array first
const [firstName, ...otherNames] = names
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
_.first
array first
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided benchmark definition and test cases, explaining what's being tested, compared, and some pros/cons of different approaches. **Benchmark Definition** The benchmark definition provides two separate JavaScript functions: `_.first` from Lodash and "array first". The purpose of this benchmark is to compare the performance of these two approaches in accessing the first element of an array. **Options Compared** * **Lodash _.first**: This function takes an array as input, extracts the first element, and returns it. It's a utility function designed to work with arrays. * **Array First**: This approach uses destructuring assignment (`const [firstName, ...otherNames] = names;`) to extract the first element from the `names` array. **Pros and Cons** 1. **Lodash _.first**: * Pros: Easy to use, well-documented, and optimized for performance. * Cons: Requires importing an additional library (Lodash), which may add overhead. 2. **Array First**: * Pros: Native JavaScript syntax, no additional imports required, and potentially faster due to reduced function call overhead. * Cons: May require more complex code to extract the first element, and may not be as performant for large arrays. **Library - Lodash** Lodash is a popular JavaScript utility library that provides a wide range of functions for common tasks, such as array manipulation, string processing, and more. The `_.first` function is one of these utility functions, designed to work with arrays. **Special JS Feature or Syntax** The "array first" approach uses destructuring assignment, which is a modern JavaScript feature introduced in ECMAScript 2015 (ES6). This syntax allows you to extract values from an array and assign them to variables without creating intermediate arrays. While it's not necessary for this benchmark, it's worth noting as a relevant JavaScript feature. **Benchmark Preparation Code** The script preparation code defines the `names` array: ```javascript var names = ["first", "middle", "last", "suffix"]; ``` This code is executed before running each test case. The HTML preparation code includes the Lodash library: ```html <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.core.js"></script> ``` **Latest Benchmark Result** The latest benchmark result shows two test cases with different execution frequencies: | Test Name | Executions Per Second | | --- | --- | | Array First | 10122575.0 | | _.first | 4848668.0 | This suggests that the "array first" approach is potentially faster for this specific benchmark. **Other Alternatives** For testing array access performance, you could also explore other approaches, such as: * Using a native JavaScript function like `Array.prototype[0]` * Creating a custom function to extract the first element of an array * Using a library like Fastify or Highsmith for benchmarking However, Lodash's _.first and "array first" approach are likely the most straightforward and efficient ways to test this specific use case.
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