Benchmark: Objekt je prázdný?

Script Preparation code:

xxx = {}

Tests:

===
Object.keys(xxx) === 0
==
Object.keys(xxx) == 0
Boolean
Boolean(Object.keys(xxx)[0])

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
===
==
Boolean

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser/OS: Chrome 120 on Android

View result in a separate tab

Test name	Executions per second
===	2932660.8 Ops/sec
==	1835539.1 Ops/sec
Boolean	2029205.8 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark definitions and explain what's being tested, compared, and the pros and cons of different approaches.

**Benchmark Definition JSON**

The provided JSON represents a benchmark definition, which is a template for creating JavaScript microbenchmarks on the MeasureThat.net website. It contains the following information:

* `Name`: The name of the benchmark.
* `Description`: An optional description of the benchmark (not used in this case).
* `Script Preparation Code`: A code snippet that prepares the test environment, specifically setting up an empty object `xxx`.
* `Html Preparation Code`: Another optional code snippet for preparing HTML elements, which is not used in this case.

**Individual Test Cases**

There are three individual test cases:

1. **"Object.keys(xxx) === 0"`**
	* The benchmark definition checks whether the length of an empty object's keys is equal to zero.
	* This test compares:
		+ `===` (strict equality operator)
		+ `==` (loose equality operator)
	* Pros and Cons:
		+ Using `===` ensures that the comparison only considers primitive values, which can lead to false positives if the object's keys are non-primitive objects.
		+ Using `==` is more permissive but may result in slower performance due to potential type coercion.
2. **"Object.keys(xxx) == 0"`**
	* This test is identical to the previous one, but uses the loose equality operator `==`.
	* The pros and cons are similar to the first test case.
3. **"Boolean(Object.keys(xxx)[0])"`**
	* This test checks whether the boolean value of the first key of an empty object's keys array is true.
	* This test compares:
		+ The `Boolean` function, which converts a value to its boolean equivalent.
	* Pros and Cons:
		+ Using `Boolean()` explicitly ensures that the comparison only considers boolean values.
		+ Without using `Boolean()`, the comparison may result in false positives if the object's keys are non-boolean objects.

**Library: Object.keys()**

The `Object.keys()` method is used to get an array of a given object's own enumerable property names. In this case, it's used to check whether an empty object has any keys. The `Object.keys()` method returns an array containing the property names as strings.

**Special JS Feature/Syntax: None**

There are no special JavaScript features or syntax used in these test cases.

**Other Alternatives**

If you wanted to implement similar benchmarks, here are some alternative approaches:

* Instead of using `===` and `==`, you could use `Object.keys(xxx).length === 0` for strict equality.
* For the loose equality operator comparison, you could use a library like Lodash's `isEqual()` function or write your own implementation using JavaScript's built-in functions.
* If you want to test the boolean value of an object's keys array, you could use `Object.keys(xxx).length ? true : false`, but this is equivalent to using `Boolean(Object.keys(xxx)[0])`.

Keep in mind that these alternatives may not provide exactly the same results as the original benchmark cases, and some might be slower or more prone to errors.

Related benchmarks:

Objekt je prázdný? (version: 0)

Comparing performance of: === vs == vs Boolean

Created: 2 years ago by: Guest

Jump to the latest result

===

==

Boolean

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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