Benchmark: isEmpty tests - MeasureThat.net

Script Preparation code:

function isEmpty1(obj) {
    return (Object.keys(obj).length === 0) && obj.constructor === Object;
}
function isEmpty2(obj) {
    for (key in obj) {
      if (Object.prototype.hasOwnProperty.call(obj, key)) {
        return false;
      }
    }
    return true;
}
var a = {};

Tests:

isEmpty1
var count = 1000; for (i=0;i<count;i++) isEmpty1(a);
isEmpty2
var count = 1000; for (i=0;i<count;i++) isEmpty2(a);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
isEmpty1
isEmpty2

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) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36

Browser/OS: Chrome 95 on Windows

View result in a separate tab

Test name	Executions per second
isEmpty1	2611.9 Ops/sec
isEmpty2	7837.2 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON benchmark definition and test cases.

**Benchmark Definition:**

The benchmark defines two JavaScript functions, `isEmpty1` and `isEmpty2`, which are used to determine if an object is empty. The main difference between these two functions lies in their approach:

* `isEmpty1`: This function checks if the object has any keys using the `Object.keys()` method and then verifies that the object's constructor is not a built-in Object type.
* `isEmpty2`: This function iterates over each key in the object using a `for...in` loop and returns `false` as soon as it finds a key. If no keys are found, it returns `true`.

**Options Compared:**

The benchmark compares two approaches:

1. **Using Object.keys()**: This approach is faster and more modern (introduced in ECMAScript 5). It checks if the object has any keys without iterating over the keys.
2. **Iterating over keys using for...in**: This approach is older and less efficient. It iterates over each key in the object and returns `false` as soon as it finds a key.

**Pros and Cons:**

* Using Object.keys():
	+ Pros:
		- Faster
		- More modern and widely supported (most browsers)
		- Avoids unnecessary iteration over keys
	+ Cons:
		- Requires JavaScript 5 or later
		- May not work as expected in some older browsers
* Iterating over keys using for...in:
	+ Pros:
		- Works in older browsers that don't support Object.keys()
		- No reliance on specific JavaScript version
	+ Cons:
		- Slower and less efficient
		- May cause issues if the object has a large number of keys or complex properties

**Library and Purpose:**

There are no external libraries used in this benchmark.

**Special JS Feature/Syntax:**

None mentioned in the provided JSON, but it's worth noting that the use of `Object.keys()` is a modern JavaScript feature introduced in ECMAScript 5.

Related benchmarks:

isEmpty tests (version: 0)

Comparing performance of: isEmpty1 vs isEmpty2

Created: 3 years ago by: Registered User

Jump to the latest result

isEmpty1

isEmpty2

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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