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

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

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

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 provided benchmark and explain what is being tested.

**Benchmark Overview**

The benchmark compares the performance of three approaches to iterate over an object:

1. **Lodash**: uses the `_each` function from the Lodash library, which iterates over the object using a callback function.
2. **Vanilla JavaScript**: uses a traditional `for` loop with `Object.entries()` method to iterate over the object's key-value pairs.

The benchmark also includes two variations of the vanilla approach:

3. **Vanilla for-loop w/ Object.entries**: uses a traditional `for` loop and destructures the key-value pair from each iteration.
4. **Object.entries for...of**: uses the `for...of` loop syntax to iterate over the object's key-value pairs.

**Lodash**

The Lodash library is a popular JavaScript utility library that provides a set of functions for various tasks, such as string manipulation, array and object manipulation, and more. In this benchmark, Lodash is used for its `_each` function, which iterates over an object using a callback function.

Pros:

* Easy to use and implement
* Reduces code size and complexity

Cons:

* Adds extra dependency (Lodash library)
* May not be suitable for all use cases or performance-critical applications

**Vanilla JavaScript**

The vanilla approach uses a traditional `for` loop with the `Object.entries()` method, which returns an array of key-value pairs. The loop then iterates over this array using a traditional `for` loop.

Pros:

* No additional dependency required
* Can be more flexible and customizable
* Often preferred for performance-critical applications

Cons:

* Requires manual memory management (loop variables)
* May not be as concise or readable as other approaches

**Variations**

The two vanilla variations differ in how they handle the key-value pairs.

1. **Vanilla for-loop w/ Object.entries**: uses a traditional `for` loop and destructures the key-value pair from each iteration using array destructuring.
Pros:

* Reduces code size and complexity
Cons:
* May not be as efficient due to array destructuring overhead

2. **Object.entries for...of**: uses the `for...of` loop syntax, which is a more modern and concise way to iterate over arrays or objects.
Pros:

* More readable and concise
Cons:
* Limited support in older browsers

**Other Considerations**

When choosing an approach, consider the following factors:

* **Performance**: if performance is critical, vanilla JavaScript with `Object.entries()` might be a better choice. However, Lodash's `_each` function can also provide good performance.
* **Code size and complexity**: Lodash's `_each` function can simplify code and reduce complexity.
* **Browser support**: consider the target browser support when choosing an approach. If older browsers need to be supported, vanilla JavaScript with `Object.entries()` might be a better choice.

**Alternatives**

Other alternatives for iterating over objects include:

1. **forEach() method**: a modern JavaScript method that iterates over arrays or objects using a callback function.
2. **for...of` loop syntax**: used for iterating over arrays, but not typically used for iterating over objects.
3. **while` loop with array indices**: a traditional approach to iterate over arrays.

Note that the choice of iteration method ultimately depends on the specific requirements and constraints of your project.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:90.0) Gecko/20100101 Firefox/90.0

Browser/OS: Firefox 90 on Windows

View result in a separate tab

Test name	Executions per second
lodash.each	2508.2 Ops/sec
lodash.map	1694.9 Ops/sec
Object.entries for...of	916.5 Ops/sec
vanilla for-loop w/ Object.entries	955.6 Ops/sec

Related benchmarks:

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

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

Created: 3 years ago by: Guest

Jump to the latest result

lodash.each

lodash.map

Object.entries for...of

vanilla for-loop w/ Object.entries

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):