Benchmark: lodash entries vs object entries

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:

Object.entries.map
Object.entries(obj).map(function([k, v]) {})
Lodash entries map
_.entries(obj).map(function([k, v]) {})

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.entries.map
Lodash entries map

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark is designed to compare two approaches: using the built-in `Object.entries()` method in JavaScript (which returns an array of key-value pairs from the object) versus using the Lodash library, specifically its `_.entries()` function. The goal is to measure which approach performs better in terms of execution speed.

**Script Preparation Code**

The script preparation code creates a large object (`obj`) with 10,000 entries, where each entry is a key-value pair with increasing integer values. This object is used as input for both test cases.

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

This code creates an array of `10000` elements, maps each element to its index value, and then reduces the array into a single object with key-value pairs.

**Html Preparation Code**

The HTML preparation code includes a script tag that loads the Lodash library version 4.17.5:

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

This allows the benchmark to run both test cases with access to the same Lodash functionality.

**Individual Test Cases**

There are two individual test cases:

1. **Object.entries.map**
	* Benchmark Definition: `Object.entries(obj).map(function([k, v]) {})`
	* This test case uses the built-in `Object.entries()` method to iterate over the key-value pairs of the `obj` object and applies an anonymous function to each pair.
2. **Lodash entries map**
	* Benchmark Definition: `_.entries(obj).map(function([k, v]) {})`
	* This test case uses Lodash's `_.entries()` function to create an iterator over the key-value pairs of the `obj` object and applies an anonymous function to each pair.

**Library - Lodash**

Lodash is a popular JavaScript utility library that provides a comprehensive set of functions for various tasks, including array manipulation, object iteration, and more. The `_` symbol refers to the global namespace of Lodash, which contains most of its functionality.

In this benchmark, the `_.entries()` function is used to create an iterator over the key-value pairs of the `obj` object, allowing for faster iteration compared to using the built-in `Object.entries()` method.

**Special JS Feature - No**

Neither test case uses any special JavaScript features or syntax that would require specific browser support or interpretations. The benchmark should run on most modern browsers and environments.

**Other Alternatives**

If you want to create a similar benchmark, here are some alternatives:

1. Use a different library: Instead of Lodash, you could use other libraries like Underscore.js, Ramda, or a custom implementation.
2. Change the object size: Adjust the number of entries in the `obj` object to see how it affects performance.
3. Add more test cases: Include additional test cases that explore different scenarios, such as iterating over arrays instead of objects.

Keep in mind that benchmarking can be complex and depends on various factors, including browser support, hardware, and environment. When creating a similar benchmark, ensure you consider these factors to get accurate results.

Related benchmarks:

lodash entries vs object entries (version: 0)

Comparing performance of: Object.entries.map vs Lodash entries map

Created: 3 years ago by: Guest

Jump to the latest result

Object.entries.map

Lodash entries 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):