Benchmark: Object.keys().forEach vs _.each

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.core.min.js"></script>

Script Preparation code:

var obj = { a: 1, b: 2, c: 3, d: 4, e: 5 };

Tests:

Object.keys().forEach
Object.keys(obj).forEach(k => { var val = obj[k]; });
_.each()
_.each(obj, (v, k) => {});

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.keys().forEach
_.each()

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

I'd be happy to explain the benchmark and its results.

**What is being tested?**

The provided JSON represents a JavaScript microbenchmark that compares two approaches for iterating over an object's keys:

1. `Object.keys().forEach`
2. `_` (Lodash)`.each`

In both cases, the test creates a sample object (`obj`) with five properties and iterates over its keys using the respective method.

**Options compared:**

* `Object.keys().forEach`: This approach uses the built-in `Object.keys()` method to get an array of an object's property names, and then uses the `forEach` method to iterate over those names.
* `_`.each`: This approach uses the Lodash library's `.each` function, which is a higher-order function that takes a callback function as an argument. The callback function is executed for each element in the array returned by `Object.keys()`.

**Pros and cons of each approach:**

* `Object.keys().forEach`:
	+ Pros: Built-in method, no additional library required, simple to implement.
	+ Cons: May have performance issues due to the overhead of calling a built-in method for every iteration.
* `_`.each`:
	+ Pros: Higher-order function, can be more efficient than `forEach` for large datasets, flexible callback function.
	+ Cons: Requires an additional library (Lodash), may have performance issues if not implemented correctly.

**Library and its purpose**

In the provided benchmark, Lodash is used as a dependency. The `_` symbol represents the root of the Lodash namespace, which provides various utility functions for tasks like array manipulation, object iteration, and more.

The `.each` function in this case is specifically designed to iterate over arrays or objects, applying a given callback function to each element.

**Special JS feature/syntax**

There are no special JavaScript features or syntax used in this benchmark. The focus is on the comparison of two iterative approaches using standard language constructs.

**Other alternatives**

If you wanted to compare these approaches without Lodash, you could use other libraries like:

* `Array.prototype.forEach` alone (without using `Object.keys()`)
* `for...in` loop
* `Array.prototype.map` and `forEach` together

Alternatively, you could implement your own iterative approach using a simple loop or recursion.

Keep in mind that the performance of these alternatives may vary depending on the specific use case and implementation.

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36

Browser/OS: Chrome 70 on Mac OS X 10.14.1

View result in a separate tab

Test name	Executions per second
Object.keys().forEach	1462882.9 Ops/sec
_.each()	2303208.8 Ops/sec

Related benchmarks:

Object.keys().forEach vs _.each (version: 1)

Comparing performance of: Object.keys().forEach vs _.each()

Created: 6 years ago by: Registered User

Jump to the latest result

Object.keys().forEach

_.each()

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):