Benchmark: keyby or map - MeasureThat.net

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var data = [
  { name: 'pi', value: 3.14 },
  { name: 'hundred', value: 100 },
  { name: 'truthy', value: true },
  { name: 'falsy', value: false },
  { name: 'estring', value: '2.71828' },
];

Tests:

keyby
_.keyBy(data, (v) => v.name);
map
data.map((v)=> v.name)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
keyby
map

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):

LLMs can make mistakes. Check important info.

I'll break down the benchmark test for you.

**What is being tested?**

The provided JSON represents two JavaScript microbenchmarks: `_.keyBy(data, (v) => v.name)` and `data.map((v) => v.name)`. The purpose of this benchmark is to compare the performance of these two methods in creating a new array with accessors for each element in the original array.

**Options being compared**

The two options being compared are:

1. **_.keyBy(data, (v) => v.name)**: This method returns an object with the values from the `data` array as keys and the corresponding value as the accessor.
2. **data.map((v) => v.name)**: This method returns a new array with the names of each element in the original array.

**Pros and Cons**

Here are some pros and cons for each approach:

1. **_.keyBy(data, (v) => v.name)**:
	* Pros:
		+ Returns an object with accessors for each element, which can be useful for certain use cases.
		+ May be faster than `map` if the resulting object is needed frequently.
	* Cons:
		+ Returns an object instead of a new array, which may not be what the user expects.
		+ Can be slower than `map` in some cases due to the overhead of creating an object.
2. **data.map((v) => v.name)**:
	* Pros:
		+ Returns a new array with the desired output, which is often what the user wants.
		+ Faster than `_.keyBy` since it doesn't involve creating an object.
	* Cons:
		+ May not provide accessors for each element, depending on the use case.

**Library and purpose**

The library being used here is **Lodash**, a popular JavaScript utility library. The `_keyBy` method is part of Lodash's `lodash` namespace and provides a way to create an object with values as keys and accessors as values.

**Special JS feature or syntax**

There are no special JavaScript features or syntaxes being tested in this benchmark. Both options use standard JavaScript methods and syntax.

**Other alternatives**

If the user wants to achieve similar results without using Lodash, they can use other libraries like **Ramda** or implement their own solution using a loop or recursion.

Some alternative approaches could be:

1. Using `Object.create(null)` to create an object with no prototype chain.
2. Implementing a custom map function that uses a loop or recursion to achieve the desired result.

However, these alternatives may not provide the same level of performance or convenience as the original Lodash implementation.

In summary, this benchmark tests the performance of two methods for creating accessors for each element in an array: `_.keyBy` from Lodash and `data.map((v) => v.name)`. The results can help users choose the best approach for their specific use case.

Related benchmarks:

keyby or map (version: 0)

Comparing performance of: keyby vs map

Created: 3 years ago by: Guest

Jump to the latest result

keyby

map

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):