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Spread vs Ramda's mergeLeft
(version: 0)
Benchmark.js
Comparing performance of:
Spread vs MergeLeft
Created:
2 years ago
by:
Guest
Go to the latest result
HTML Preparation code:
<script src="//cdnjs.cloudflare.com/ajax/libs/ramda/0.29.1/ramda.min.js"></script>
Tests:
Spread
var a = { a: 'oh', b: 'my' }; var b = { b: 'my2', c: 'goddess' }; var c = { ...a, ...b };
MergeLeft
var a = { a: 'oh', b: 'my' }; var b = { b: 'my2', c: 'goddess' }; var c = R.mergeLeft(b, a);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Spread
MergeLeft
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36
Browser/OS:
Chrome 119 on Mac OS X 10.15.7
View result in a separate tab
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=486613" width="100%" height="500px"></iframe>
Spread
15.6M/s
MergeLeft
4.5M/s
View exact numbers
Test name
Executions per second
✓
Spread
15,611,165 Ops/sec
MergeLeft
4,527,934 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the benchmark and explain what's being tested, compared, and their pros and cons. **Benchmark Overview** The benchmark compares the performance of two approaches to merge two objects: the traditional JavaScript spread operator (`...`) and Ramda's `mergeLeft` function. The test creates three objects (`a`, `b`, and `c`) with overlapping properties, then uses each approach to create a new object that combines `a` and `b` (or vice versa). **Options Compared** 1. **Spread Operator (`...`)**: * This is the traditional JavaScript way to merge two objects. * It creates a new object by copying all properties from the first object (`a`) and adding any additional properties from the second object (`b`). * Pros: Simple, widely supported, and easy to understand. * Cons: Can lead to slower performance due to property iteration and creation of a new object. 2. **Ramda's `mergeLeft` function**: * This is a functional programming approach to merging two objects. * It creates a new object by copying all properties from the first object (`a`) and adding any additional properties from the second object (`b`), while preserving the original property order. * Pros: Efficient, as it avoids creating a new object or iterating over properties. It also preserves the original property order. * Cons: Requires knowledge of Ramda library and functional programming concepts. **Other Considerations** * **Object size**: The benchmark's performance may vary depending on the size of the objects being merged. * **Property names**: If the property names are unique, the spread operator might be slightly faster due to faster lookup times in JavaScript. However, this is not a guarantee, and Ramda's `mergeLeft` function can still outperform the spread operator for larger object sizes. **Library: Ramda** Ramda is a popular functional programming library for JavaScript that provides various utility functions, including `mergeLeft`. The `mergeLeft` function takes two objects as arguments and returns a new object with merged properties, preserving the original property order. This approach can be beneficial when you need to preserve the original structure of one of the objects. **Special JS Feature: None** There are no special JavaScript features or syntax used in this benchmark. **Alternatives** If you're looking for alternative approaches to merging objects, consider: 1. **Lodash's `merge` function**: Similar to Ramda's `mergeLeft`, but with a different implementation and API. 2. **Object.assign() method**: Another way to merge objects in JavaScript, which is more efficient than the spread operator when dealing with large object sizes. 3. **Immutable.js library**: A popular alternative to traditional object creation and merging, offering a functional programming approach. Keep in mind that the choice of approach depends on your specific use case, performance requirements, and personal preference.
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