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foreach vs foreach keyby
(version: 0)
Comparing performance of:
foreach vs keyby
Created:
6 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 arr= [{"idChat":2089,"_id":"c87e5f39-c282-4927-9b47-646a4e787c9c","id":"4515","system":false,"text":"2","image":null,"remoteFile":null,"createdAt":"2019-07-20T02:25:00.779Z","dateSent":"2019-07-20T02:25:01.590Z","dateReceived":"19/07/2019 23:25:02","uploaded":false,"audio":null,"duration":null,"fileType":null,"user":{"_id":3,"name":"Dr. João Roberto","avatar":"","priorityColor":"#FFBE27"}},{"idChat":2089,"_id":"4515","id":"4515","system":false,"text":"2","image":null,"remoteFile":null,"createdAt":"2019-07-20T02:25:00.779Z","dateSent":"2019-07-20T02:25:01.590Z","dateReceived":null,"uploaded":true,"audio":null,"duration":0,"fileType":"text/plain","user":{"_id":3,"name":"Dr. João Roberto","avatar": "","priorityColor":"#FFBE27"}}]
Tests:
foreach
let table = {}; _.forEach(arr, m => table[m.createdAt] = m)
keyby
let table = {}; table = _.keyBy(arr,'createdAt')
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
foreach
keyby
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 is being tested. **Benchmark Definition** The benchmark is comparing two approaches to iterate over an array: 1. `_.forEach(arr, m => table[m.createdAt] = m)`: This uses the `forEach` method with a callback function to iterate over the array. The callback function accesses each element of the array using its index (`m`) and assigns it to a property in the object `table`, based on the value of `m.createdAt`. 2. `let table = {}; table = _.keyBy(arr,'createdAt')`: This uses the `keyBy` method from the Lodash library to iterate over the array. The `keyBy` method returns an object with each element of the array as a key and its corresponding value. **What is being tested?** The benchmark is testing which approach (`.forEach` or `keyBy`) is faster for this specific use case. Specifically, it's measuring how many executions per second (EPS) can be achieved on a desktop device running Chrome 109. **Options compared** Two options are being compared: 1. `.forEach`: Uses the `forEach` method with a callback function to iterate over the array. 2. `keyBy`: Uses the `keyBy` method from Lodash library to create an object with each element of the array as a key and its corresponding value. **Pros and Cons** **`.forEach` approach:** Pros: * Easy to understand and implement * Works well for small to medium-sized arrays Cons: * May not be efficient for large arrays, as it creates a new property on the `table` object for each iteration. * The callback function can make the code harder to read and maintain. **`keyBy` approach:** Pros: * Efficient for large arrays, as it uses an optimized algorithm under the hood * Returns a hash table-like object with fast lookup times Cons: * Requires the use of Lodash library, which may add overhead. * The API can be unfamiliar to developers without prior experience with Lodash. **Library:** The `_.keyBy` method is part of the Lodash library. Lodash is a popular utility library for JavaScript that provides various functions for working with arrays, objects, and more. **Special JS feature or syntax:** None of the test cases use any special JavaScript features or syntax beyond what's commonly available in modern browsers. **Other alternatives:** If you're not using Lodash, you can implement a similar `keyBy` function from scratch using JavaScript. However, this would likely be less efficient and more verbose than using the optimized `keyBy` method provided by Lodash. In summary, the benchmark is testing which approach (`.forEach` or `keyBy`) is faster for iterating over an array in JavaScript. The `.forEach` approach is easy to understand but may not be efficient for large arrays, while the `keyBy` approach provides better performance but requires the use of Lodash library.
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