Benchmark: Iterating Lodash Entries vs Object.entries (10,000 entries)

HTML Preparation code:

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

Script Preparation code:

window.obj = Array.from({length: 10_000}).reduce((acc, _, i) => {
    return {...acc, [`key${i}`]: `val{i}`}
}, {})

Tests:

Object.entries
let count = 0 for (const [key, value] of Object.entries(obj)) { count++; }
lodash.entries
let count = 0 for (const [key, value] of _.entries(obj)) { count++; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.entries
lodash.entries

Fastest: N/A

Slowest: N/A

Latest run results:

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

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

**Benchmark Definition**

The benchmark is comparing the performance of two approaches to iterate over the entries of an object:

1. **`Object.entries(obj)`**: This method returns an array of key-value pairs for every entry in the object `obj`. It uses a built-in JavaScript feature, which is supported by all modern browsers and engines.
2. **`_.entries(obj)`**: This method is part of the Lodash library (version 4.17.5) and returns the same array of key-value pairs as `Object.entries()`. The underscore prefix refers to the Lodash alias.

**Script Preparation Code**

The script preparation code generates a sample object with 10,000 entries, where each entry has a unique key and value.

```javascript
window.obj = Array.from({length: 10_000}).reduce((acc, _, i) => {
    return {...acc, [`key${i}`]: `val{i}`}
}, {})
```

This code uses the spread operator (`...`) to create a new object with each entry having a unique key-value pair.

**Html Preparation Code**

The HTML preparation code includes the Lodash library (version 4.17.5) via an external script tag:

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

This ensures that the Lodash library is available for use in the benchmark tests.

**Test Cases**

The test cases are defined as follows:

1. **`Object.entries`**: This test case uses the built-in JavaScript method `Object.entries()` to iterate over the entries of the object.
2. **`.entries(obj)`**: This test case uses the Lodash library's `_.entries()` function to iterate over the entries of the object.

**Options Compared**

The benchmark compares two options:

1. Using the built-in JavaScript method `Object.entries()`.
2. Using the Lodash library's `_.entries()` function.

**Pros and Cons**

Here are some pros and cons of each approach:

* **`Object.entries()`**:
	+ Pros: Built-in JavaScript feature, no external dependency.
	+ Cons: May have performance overhead due to the creation of an array.
* **`.entries(obj)`**:
	+ Pros: Faster execution speed compared to `Object.entries()`, thanks to Lodash's optimized implementation.
	+ Cons: Requires an external dependency (Lodash library) and may not be supported in older browsers.

**Library: Lodash**

The Lodash library is a popular utility belt for JavaScript developers, providing various functions for tasks such as array manipulation, object iteration, and more. In this benchmark, the `_.entries()` function is used to iterate over the entries of an object.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntax mentioned in this benchmark. Both tests use standard JavaScript methods and Lodash library functions.

**Alternatives**

Some alternatives for iterating over object entries include:

* Using a for...in loop: `for (const key in obj) { ... }`
* Using a for...of loop with Object.keys(): `for (const key of Object.keys(obj)) { ... }`
* Using a custom implementation using Array.prototype.forEach() or other methods.

Keep in mind that the performance differences between these alternatives may vary depending on the specific use case and browser/engine being used.

Related benchmarks:

Iterating Lodash Entries vs Object.entries (10,000 entries) (version: 0)

Comparing performance of: Object.entries vs lodash.entries

Created: 4 years ago by: Guest

Jump to the latest result

Object.entries

lodash.entries

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):