Benchmark: Object no keys vs isEmpty

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.19/lodash.min.js"></script>

Script Preparation code:

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

Tests:

Has no keys
!window.obj || !Object.keys(window.obj).length;
Is not empty
!_.isEmpty(window.obj);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Has no keys
Is not empty

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 6 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36

Browser/OS: Chrome 142 on Windows

View result in a separate tab

Test name	Executions per second
Has no keys	677593.8 Ops/sec
Is not empty	753064.3 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON and explain what's being tested.

**Benchmark Overview**

The benchmark measures the performance difference between two approaches to check if an object has no keys or if it's empty using JavaScript.

**Script Preparation Code**

The script preparation code creates an object `window.obj` and populates it with 100 properties, each containing a unique key-value pair:
```javascript
for (var i = 0, len = 100; i < len; i++) {
  obj['key' + i] = 'value' + i;
}
```
This creates an object with a large number of keys and values.

**Html Preparation Code**

The HTML preparation code includes a reference to the Lodash library (`lodash.min.js`) which provides utility functions for working with arrays, objects, and more:
```html
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.19/lodash.min.js"></script>
```
Lodash is used in the benchmark test cases.

**Benchmark Test Cases**

There are two individual test cases:

1. **"Has no keys"**: The benchmark definition uses the conditional operator `!` to check if the object has no keys:
```javascript
!window.obj || !Object.keys(window.obj).length;
```
This checks if the object is empty or not.

2. **"Is not empty"**: The second test case uses Lodash's `isEmpty()` function to check if the object is empty:
```javascript
 _.isEmpty(window.obj);
```
This is a more concise way of checking if an object has no keys.

**Comparison of Approaches**

Both approaches achieve the same result, but they differ in syntax and performance:

1. **Lodash's `isEmpty()`**: This approach is more concise and easier to read. However, it might incur a slight performance overhead due to the function call.
2. **Conditional operator (`!`) + `Object.keys()`**: This approach is faster because it directly checks if the object has any keys without using an additional function call.

**Pros and Cons**

* Lodash's `isEmpty()`:
	+ Pros: More concise, easier to read
	+ Cons: Might incur a slight performance overhead
* Conditional operator (`!`) + `Object.keys()`:
	+ Pros: Faster, direct check of object keys
	+ Cons: Less concise, requires more manual effort

**Other Considerations**

The benchmark assumes that the object is being checked for emptiness and not modified after creation. If the object might be modified, additional considerations would be necessary.

In terms of special JS features or syntax, there are none explicitly mentioned in this benchmark. However, it's worth noting that modern JavaScript engines often include optimizations and built-in support for certain data structures (e.g., typed arrays, WebAssembly) that could impact performance in specific scenarios.

**Alternatives**

Other alternatives to Lodash's `isEmpty()` could include:

* Using the `hasOwnProperty()` method on each key to check if it exists:
```javascript
for (var i = 0; i < Object.keys(window.obj).length; i++) {
  if (!window.obj.hasOwnProperty('key' + i)) break;
}
```
However, this approach is less concise and might be slower due to the repeated checks.

Another alternative could be using a library like Fastest-Forward or Benchmark.js, which provide more robust benchmarking features and support for various performance metrics.

Related benchmarks:

Object no keys vs isEmpty (version: 0)

Comparing performance of: Has no keys vs Is not empty

Created: 5 years ago by: Guest

Jump to the latest result

Has no keys

Is not empty

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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