Benchmark: for-in Check vs Object.keys.length vs _.isEmpty

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>

Script Preparation code:

window.obj = {};

for (var i = 0, len = 100; i < len; i++) {
  obj['key' + i] = 'value' + i;
}

Tests:

for-in checking
for (const _ in window.obj) { return false; } return true;
Object.keys.length
Object.keys(window.obj).length === 0;
_.isEmpty
_.isEmpty(window.obj);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for-in checking
Object.keys.length
_.isEmpty

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 benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark is designed to compare the performance of three different approaches:

1. `for-in` checking
2. `Object.keys.length`
3. `_.isEmpty` (using the Lodash library)

These approaches are used to check if an object (`window.obj`) is empty.

**What's being tested?**

In this benchmark, we have a predefined object `window.obj` that contains 100 properties. The goal is to determine which approach is the fastest in terms of execution time.

Here's a brief explanation of each approach:

1. **for-in checking**: This approach uses the `for...in` loop to iterate over the object's properties and checks if any property exists. If no properties exist, it returns false; otherwise, it returns true.
2. **Object.keys.length**: This approach uses the `Object.keys()` method to get an array of the object's property names, and then checks if the length of that array is 0. If the length is 0, it means the object is empty.
3. **_.isEmpty** (using Lodash): This approach uses the `lodash.isEmpty` function to check if the object is empty.

**Options comparison**

Here are the pros and cons of each approach:

1. **for-in checking**:
	* Pros: Simple and straightforward, doesn't require additional libraries.
	* Cons: Can be slower due to the overhead of iterating over properties.
2. **Object.keys.length**:
	* Pros: Efficient and reliable, as `Object.keys()` is a built-in method.
	* Cons: May be slower for very large objects due to the array creation step.
3. **_.isEmpty** (using Lodash):
	* Pros: Lightweight and efficient, as it's implemented in native JavaScript.
	* Cons: Requires an additional library installation.

In general, `Object.keys.length` is a good trade-off between performance and simplicity, while `_isEmpty` offers a lightweight alternative with minimal overhead. `for-in checking` can be slower due to the iteration step, but it's still a viable option for simple cases.

**Library usage**

The benchmark uses the Lodash library (`https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js`) to implement the `_isEmpty` function. This allows users to easily compare the performance of different approaches with and without additional libraries.

**JavaScript feature or syntax**

There are no specific JavaScript features or syntaxes being tested in this benchmark. However, it's worth noting that the use of `const` and template literals (e.g., `"key" + i`) is modern JavaScript syntax.

**Alternative approaches**

Other alternatives could include:

* Using a simple object literal check (e.g., `Object.keys(window.obj).length === 0`)
* Utilizing a more efficient data structure, such as a Set or Map
* Leveraging browser-specific optimizations or hardware features

Keep in mind that the best approach will depend on the specific use case and requirements of your project.

I hope this explanation helps!

Related benchmarks:

for-in Check vs Object.keys.length vs _.isEmpty (version: 0)

Comparing performance of: for-in checking vs Object.keys.length vs _.isEmpty

Created: 4 years ago by: Guest

Jump to the latest result

for-in checking

Object.keys.length

_.isEmpty

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):