Benchmark: _.isEmpty vs _.size comparison

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:

_.isEmpty
_.isEmpty(window.obj);
_.size
_.size(window.obj);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.isEmpty
_.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 MeasureThat.net and explore what's being tested in this benchmark.

**Benchmark Overview**

The benchmark compares the performance of two functions from the Lodash library: `_.isEmpty` and `_.size`. The test creates an object with 100 keys and assigns a string value to each key. The goal is to determine which function is faster when called on this object.

**Options Compared**

There are two options being compared:

1. **_.isEmpty**: This function returns a boolean value indicating whether the input object is empty.
2. **_.size**: This function returns the number of elements in the input object (in this case, the number of keys).

**Pros and Cons of Each Approach**

* **_.isEmpty**:
	+ Pros: Simple to implement, easy to understand.
	+ Cons: May be slower for large objects due to the overhead of checking each property.
* **_.size**:
	+ Pros: Often faster for large objects, as it only needs to iterate over the keys once.
	+ Cons: May be slower for small objects, as it still performs an iteration.

In general, `_.isEmpty` is a better choice when working with small objects or when performance is not a top priority. On the other hand, `_.size` is a better choice when working with large objects or when performance is critical.

**Lodash Library**

The Lodash library is a popular JavaScript utility library that provides a wide range of functions for various tasks, such as array manipulation, object transformation, and more. In this benchmark, the `_` symbol is used to reference the `lodash` namespace, which contains the `isEmpty` and `size` functions.

**No Special JS Features or Syntax**

There are no special JavaScript features or syntax used in this benchmark. It's a straightforward test that compares the performance of two Lodash functions on an object created using vanilla JavaScript.

**Alternative Approaches**

If you wanted to implement these functions yourself without using the Lodash library, you could use the following approaches:

* **_.isEmpty**: Iterate over each property of the object and check if it exists in a `for...in` loop. If no properties exist, return `true`.
* **_.size**: Use the `Object.keys()` method to get an array of keys from the object and then return its length.

However, using a library like Lodash can provide significant performance benefits and make your code more readable and maintainable.

I hope this explanation helps! Let me know if you have any further questions.

Related benchmarks:

_.isEmpty vs _.size comparison (version: 0)

Comparing performance of: _.isEmpty vs _.size

Created: 6 years ago by: Guest

Jump to the latest result

_.isEmpty

_.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):