Benchmark: _.isEmpty vs Object.keys.length vsasdasdasd

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);
Object.keys().length
Object.keys(window.obj).length === 0;
loop
function isEmpty(obj) { for(var prop in obj) { if(obj.hasOwnProperty(prop)) return false; } return true; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
_.isEmpty
Object.keys().length
loop

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:87.0) Gecko/20100101 Firefox/87.0

Browser/OS: Firefox 87 on Windows

View result in a separate tab

Test name	Executions per second
_.isEmpty	3478602.2 Ops/sec
Object.keys().length	1028266.5 Ops/sec
loop	859404864.0 Ops/sec

Autogenerated LLM Summary (model gemma2:9b, generated 2 months ago):

LLMs can make mistakes. Check important info.

This benchmark compares three different ways to check if an object is empty in JavaScript:

**1. `_.isEmpty(window.obj)`:** This uses the `isEmpty` function from the Lodash library. Lodash is a popular library that provides utility functions for working with arrays, objects, and strings in JavaScript.

* **Pros:** Concise and potentially optimized by the Lodash team.
* **Cons:** Requires an external dependency (Lodash).

**2. `Object.keys(window.obj).length === 0;`:** This uses the built-in `Object.keys` method to get an array of all keys in the object and then checks if the length of this array is zero.

* **Pros:** No external dependencies, relies on native JavaScript functionality.
* **Cons:** Might be slightly less performant than Lodash's implementation or the custom loop solution.

**3. `function isEmpty(obj) { ... }`:** This implements a custom function using a for-in loop to iterate over the properties of the object and check if any properties exist.

* **Pros:** Provides granular control over the logic.
* **Cons:** Can be more verbose than the other options, might not be as optimized as the built-in methods or Lodash's implementation.

**Other Considerations:**

* **Benchmark Context:** The results of this benchmark are specific to the code and environment used. Different implementations, libraries, or even browser versions can affect performance.

* **Edge Cases:**  The benchmark may not cover all possible edge cases related to object emptiness (e.g., objects with inherited properties).

**Alternatives:**

While the provided benchmarks focus on checking for empty objects, there are other ways to achieve this goal:

* **`Object.keys()` and `reduce()`: ** You can use `Object.keys()` to get the keys and then apply a `reduce()` function that checks if any key exists.
* **Truthy/Falsy Checks:** JavaScript has truthy/falsy values. An empty object is considered falsy, so you could simply check if `window.obj` evaluates to false. Keep in mind this approach might be less explicit about what you're doing.

Related benchmarks:

_.isEmpty vs Object.keys.length vsasdasdasd (version: 0)

Comparing performance of: _.isEmpty vs Object.keys().length vs loop

Created: 3 years ago by: Guest

Jump to the latest result

_.isEmpty

Object.keys().length

loop

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gemma2:9b, generated 2 months ago):