Benchmark: Object Length vs Lodash Size 100k

HTML Preparation code:

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

Script Preparation code:

var arr = new Array(100000).fill("");
var obj = {};

 for (const key of arr) {
      obj[key] = "foo";
 }

Tests:

Length
Object.keys(obj).length
Lodash Size
_.size(obj);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Length
Lodash Size

Fastest: N/A

Slowest: N/A

Latest run results:

No previous 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 dive into the world of microbenchmarks.

The provided JSON represents a JavaScript benchmark test case for measuring the performance difference between two approaches: using the `Object.keys()` method and relying on the built-in length property to determine the size of an object.

**Benchmark Definition**

The first part of the JSON defines the overall benchmark. Here, we have:

* `Name`: The name of the benchmark, which is "Object Length vs Lodash Size 100k".
* `Description`: An empty string, indicating that there's no descriptive text for this benchmark.
* `Script Preparation Code`: A JavaScript code snippet that:
	+ Creates an array of 100,000 elements with a single value ("foo").
	+ Initializes an object (`obj`) and populates it with key-value pairs using the array as keys. This is done to ensure that both methods are executed on a large dataset.
* `Html Preparation Code`: A reference to a CDN-hosted version of the Lodash library (version 4.17.5) via a `<script>` tag.

**Individual Test Cases**

The second part of the JSON defines two individual test cases:

1. **"Length"`:
	* `Benchmark Definition`: The code snippet `Object.keys(obj).length`, which measures the length property of the `obj` object.
2. **"Lodash Size"`:
	* `Benchmark Definition`: The code snippet `_ = obj; _.size;`, which uses Lodash to measure the size of the `obj` object.

**Pros and Cons**

1. **Using `Object.keys()` method**:
	* Pros: Simple, easy to understand, and widely supported.
	* Cons: May incur additional overhead due to the need to call a method on the object, which could be slower than accessing the length property directly.
2. **Relying on built-in length property**:
	* Pros: Directly accessible and likely to be faster since it doesn't involve an extra function call.
	* Cons: Less readable and might not work consistently across all browsers or environments.

**Lodash Library**

The Lodash library is a popular utility belt for JavaScript that provides a collection of functions for various tasks, such as:

* Iteration (e.g., `_.forEach`, `_.map`)
* String manipulation (e.g., `_.string.escape`)
* Array and object manipulation (e.g., `_.size`, `_.keys`)

In this benchmark, Lodash is used to measure the size of an object by calling `_ = obj; _.size;`. The `_` variable is a common convention in Lodash for assigning a value to a function without overwriting its name.

**Special JS Features/Syntax**

There are no special JavaScript features or syntax mentioned in this benchmark. However, if you're interested in exploring other microbenchmarks that utilize specific features like async/await, promises, or modern ES6+ constructs, I'd be happy to help with that as well!

**Other Alternatives**

If you're looking for alternative approaches or frameworks for microbenchmarking JavaScript code, here are a few examples:

* `Benchmark.js`: A popular library for creating and running benchmarks.
* `js-benchmark`: Another lightweight benchmarking library for JavaScript.
* `Benchmarking libraries in Node.js` (e.g., `benchpress`, `jest-bench`)

Related benchmarks:

Object Length vs Lodash Size 100k (version: 0)

Comparing performance of: Length vs Lodash Size

Created: 2 years ago by: Guest

Jump to the latest result

Length

Lodash Size

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):