Benchmark: Loop over object: lodash vs Object.entries fork by d9k 3

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]) {})
Object.entries + for
const entries = Object.entries(obj); for (let i = 0; i < entries.length; i++) { const [k, v] = entries[i]; }
Object.entries + for..of
for (let [k, v] of Object.entries(obj)) { // }
forEach
Object.keys(obj).forEach(function (k) { let v = obj[k]; // });
for..in
for (const k in obj) { if (obj.hasOwnProperty(k)) { let v = obj[k]; } }
lodash.forOwn
_.forOwn(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
Object.entries + for
Object.entries + for..of
forEach
for..in
lodash.forOwn

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its various components.

**Benchmark Definition**

The test is comparing four approaches to iterate over an object:

1. Using `lodash.each`
2. Using `lodash.map`
3. Using `Object.entries` with a for loop
4. Using `Object.entries` with a for...of loop

**Options Compared**

Each option has its own strengths and weaknesses.

* **Lodash (`_.each` and `_map`)**: Lodash is a popular utility library that provides a lot of useful functions, including iteration methods. These functions are often faster than the built-in `for` loop but come with a larger footprint due to the library's dependencies.
	+ Pros: Often faster, simpler code
	+ Cons: Adds extra dependency, potential performance overhead
* **Built-in `Object.entries` with for loop**: This approach uses the `Object.entries()` method to get an array of key-value pairs from the object and then loops through it using a traditional for loop.
	+ Pros: Lightweight, no additional dependencies
	+ Cons: Can be slower due to the overhead of the loop variable declaration
* **Built-in `Object.entries` with for...of loop**: This approach is similar to the previous one but uses a for...of loop instead of a traditional for loop. The for...of loop is more modern and often faster.
	+ Pros: Modern, potentially faster than traditional for loops
	+ Cons: Still has the overhead of the loop variable declaration
* **Built-in `forEach`**: This approach uses the built-in `forEach()` method to iterate over an array (or object in this case).
	+ Pros: Simple, often faster than traditional for loops
	+ Cons: Not designed specifically for iterating over objects, can be slower

**Library Descriptions**

The benchmark uses two libraries:

1. **Lodash**: A popular utility library that provides a lot of useful functions, including iteration methods (`_.each` and `_map`). Lodash is often faster than the built-in `for` loop but comes with a larger footprint due to its dependencies.
2. **lodash.forkOwn** (not shown in the benchmark): This is another function from the Lodash library that iterates over an object, similar to `_.each`. It's not used in this specific benchmark.

**Special JS Feature/Syntax**

The benchmark does not explicitly use any special JavaScript features or syntax beyond what's mentioned above. However, it does take advantage of modern features like for...of loops and the built-in `Object.entries()` method.

In summary, the benchmark is comparing four approaches to iterate over an object:

* Lodash (`_.each` and `_map`)
* Built-in `Object.entries` with a for loop
* Built-in `Object.entries` with a for...of loop
* Built-in `forEach`

Each option has its own strengths and weaknesses, and the choice of approach depends on the specific use case and performance requirements.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36

Browser/OS: Chrome 110 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
lodash.each	3673.4 Ops/sec
lodash.map	3596.8 Ops/sec
Object.entries.map	1365.0 Ops/sec
Object.entries + for	1671.0 Ops/sec
Object.entries + for..of	1434.1 Ops/sec
forEach	1170.6 Ops/sec
for..in	576.6 Ops/sec
lodash.forOwn	3031.2 Ops/sec

Related benchmarks:

Loop over object: lodash vs Object.entries fork by d9k 3 (version: 0)

Comparing performance of: lodash.each vs lodash.map vs Object.entries.map vs Object.entries + for vs Object.entries + for..of vs forEach vs for..in vs lodash.forOwn

Created: 4 years ago by: Registered User

Jump to the latest result

lodash.each

lodash.map

Object.entries.map

Object.entries + for

Object.entries + for..of

forEach

for..in

lodash.forOwn

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):