Benchmark: Loop over object: lodash vs Object.entries [2]

HTML Preparation code:

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

Script Preparation code:

var obj = Array.from({ length: 10000 }).map((value, i) => i).reduce((val, v) => { val[v] = v; return val; }, {})

Tests:

lodash.each
_.each(obj, function(v, k) {})
lodash.map
_.map(obj, function(v, k) {})
Object.entries.map
Object.entries(obj).map(function([k, v]) {})
vanilla for-loop w/ Object.entries
const entries = Object.entries(obj); for (let i = 0; i < entries.length; i++) { const [k, v] = entries[i]; }
lodash.forEach
_.forEach(obj, function(v, k) {})

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lodash.each
lodash.map
Object.entries.map
vanilla for-loop w/ Object.entries
lodash.forEach

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; rv:97.0) Gecko/20100101 Firefox/97.0

Browser/OS: Firefox 97 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
lodash.each	2677.7 Ops/sec
lodash.map	1855.1 Ops/sec
Object.entries.map	1001.5 Ops/sec
vanilla for-loop w/ Object.entries	1165.9 Ops/sec
lodash.forEach	2771.9 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its test cases.

**Benchmark Definition**

The benchmark is testing the performance of different approaches to iterate over an object in JavaScript. The benchmark is comparing four methods:

1. `lodash.each`
2. `lodash.map`
3. `vanilla for-loop with Object.entries` (using a traditional for loop with `Object.entries`)
4. `Object.entries.map`

**Benchmark Preparation Code**

The script preparation code creates an array of 10,000 objects and reduces it to create an object with the same properties. The resulting object is then assigned to the `obj` variable.

**Html Preparation Code**

The HTML preparation code includes a script tag that loads the Lodash library (version 4.17.5) from a CDN.

**Test Cases**

Each test case represents a single benchmarking iteration:

1. **`lodash.each`**: Calls the `each` method on the `obj` object, passing a callback function that takes two arguments: `v` and `k`.
2. **`lodash.map`**: Calls the `map` method on the `obj` object, passing a callback function that returns a new value.
3. **`vanilla for-loop with Object.entries`**: Uses a traditional for loop to iterate over the properties of the `obj` object using `Object.entries`.
4. **`Object.entries.map`**: Calls the `map` method on the result of `Object.entries(obj)`, passing a callback function that takes two arguments: `[k, v]`.

**Library**

Lodash is a popular JavaScript library that provides functional programming utilities. In this benchmark, Lodash is used to provide `each`, `map`, and other utility functions.

**Pros and Cons of Different Approaches**

1. **`lodash.each`**: Pros:
	* Optimized for iteration over objects.
	* Provides a simple and concise API.
Cons:
	* Requires loading an additional library (Lodash).
2. **`lodash.map`**: Pros:
	* Returns a new array with mapped values.
	* Can be used to transform objects.
Cons:
	* May not be suitable for iteration over large objects due to memory usage.
3. **`vanilla for-loop with Object.entries`**: Pros:
	* No additional library is required.
	* Allows for fine-grained control over loop logic.
Cons:
	* Can be verbose and error-prone.
4. **`Object.entries.map`**: Pros:
	* Combines the benefits of `lodash.each` and `map`.
Cons:
	* May still require loading an additional library (Lodash) if not already loaded.

**Special JS Feature/Syntax**

There is no special JavaScript feature or syntax used in this benchmark. It relies solely on standard JavaScript features like objects, arrays, loops, and functions.

**Other Alternatives**

If you don't want to use Lodash or any other library for iteration over objects, you could consider using:

* `Array.prototype.forEach()`: A built-in method that iterates over an array.
* `for...of` loop: A new syntax for looping over arrays and objects introduced in ECMAScript 2015.

Keep in mind that these alternatives may have different performance characteristics compared to the benchmarked methods.

Related benchmarks:

Loop over object: lodash vs Object.entries [2] (version: 0)

Comparing performance of: lodash.each vs lodash.map vs Object.entries.map vs vanilla for-loop w/ Object.entries vs lodash.forEach

Created: 2 years ago by: Guest

Jump to the latest result

lodash.each

lodash.map

Object.entries.map

vanilla for-loop w/ Object.entries

lodash.forEach

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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