Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
fromEntries vs reduce rey
(version: 0)
Comparing performance of:
fromEntries vs reduce
Created:
3 years ago
by:
Registered User
Jump to the latest result
Script Preparation code:
var plans = []; for (let i = 0; i < 1000; i++) { plans.push({ code: `plan_${i}` }); }
Tests:
fromEntries
Object.fromEntries(plans.map(plan => [plan.code, plan]))
reduce
plans.reduce((acc, plan) => { acc[plan.code] = plan; return acc; }, {});
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
Fork
Test case name
Result
fromEntries
reduce
Fastest:
N/A
Slowest:
N/A
Latest run results:
No previous run results
This benchmark does not have any results yet. Be the first one
to run it!
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided JSON and explain what's being tested. **Benchmark Definition** The benchmark is comparing two approaches to create an object from an array of key-value pairs: 1. `Object.fromEntries(plans.map(plan => [plan.code, plan]))` 2. `plans.reduce((acc, plan) => {\r\n acc[plan.code] = plan;\r\n return acc;\r\n }, {})` These two approaches are trying to achieve the same result, which is to create an object where each key is a unique code and its corresponding value is the entire `plan` object. **Options Compared** The benchmark is comparing the performance of these two approaches: 1. **Object.fromEntries**: This method creates an object from an array of key-value pairs using the `fromEntries` method. It's a modern JavaScript feature that was introduced in ECMAScript 2019. 2. **Reduce**: This approach uses the `reduce` method to iterate over the array and create an object. **Pros and Cons** * **Object.fromEntries**: + Pros: Concise, efficient, and readable code. + Cons: May not be supported by older browsers or environments that don't have access to modern JavaScript features. * **Reduce**: + Pros: Widely supported across different browsers and environments. Can be used in older versions of JavaScript. + Cons: Requires more code and may be less efficient than `Object.fromEntries`. **Library and Purpose** Neither of the approaches relies on a specific library, but both use built-in JavaScript methods. **Special JS Features/Syntax** * **Object.fromEntries**: This method uses a modern JavaScript feature that was introduced in ECMAScript 2019. It's not widely supported across all browsers or environments. * **Reduce**: This method has been part of the JavaScript language since its inception and is widely supported. **Other Alternatives** If you don't want to use `Object.fromEntries`, you could also use other approaches, such as: 1. Using a library like Lodash's `fromPairs` function. 2. Creating an object manually using a loop or recursion. 3. Using the `Array.prototype.reduce()` method with a custom callback function. Keep in mind that these alternatives may have different performance characteristics and may not be as concise as `Object.fromEntries`. In summary, the benchmark is comparing two approaches to create an object from an array of key-value pairs: `Object.fromEntries` (a modern JavaScript feature) and `reduce` (a widely supported but less efficient approach).
Related benchmarks:
flatMap vs reduce using push
fill + map vs push
flatMap vs reduce test
Object.fromEntries vs reduce round 2
flatMap vs reduce (push)
Comments
Confirm delete:
Do you really want to delete benchmark?