Benchmark: delete vs falsify

Script Preparation code:

var obj = {
    k: [true, {}, 1, "a"],
    x: 1
};

Tests:

delete
delete obj.k;
falsify
obj.k = false;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
delete
falsify

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.4972.0 Safari/537.36

Browser/OS: Chrome 102 on Windows

View result in a separate tab

Test name	Executions per second
delete	12549633.0 Ops/sec
falsify	12228753.0 Ops/sec

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

LLMs can make mistakes. Check important info.

**What is tested on the provided JSON?**

The provided JSON represents a benchmark test case for comparing two approaches to modify an object in JavaScript: deleting a property (`delete obj.k;`) and falsifying a value (`obj.k = false;`). The test is designed to measure which approach is faster.

**Options compared:**

There are two options being compared:

1. **Delete**: This approach uses the `delete` keyword to remove the `k` property from the object `obj`. This method only removes the reference to the property, but does not actually delete the memory location associated with it.
2. **Falsify**: This approach sets the value of the `k` property to `false`, effectively making it a falsy value in JavaScript.

**Pros and Cons of each approach:**

* **Delete**:
	+ Pros: Can be faster since it only removes the reference to the property, without creating a new object or modifying the existing one.
	+ Cons: Does not actually delete the memory location associated with the property, which can lead to memory leaks if not used carefully. Additionally, some JavaScript engines may not optimize `delete` as well as other operations.
* **Falsify**:
	+ Pros: Can be faster since it creates a new falsy value, without modifying the existing object or creating a temporary variable. This approach also avoids potential issues with memory leaks.
	+ Cons: Creates an unnecessary property on the object, which can increase memory usage.

**Library and its purpose**

None of the provided benchmark test cases use any external libraries.

**Special JavaScript feature or syntax**

There is no special JavaScript feature or syntax being tested in this benchmark. However, it's worth noting that some JavaScript engines may optimize certain operations more than others due to their implementation details.

**Other alternatives**

Other approaches to modify an object could be:

* Creating a new object with the desired properties and assigning it to the original object: `const newObj = { k: false }; obj = newObj;`
* Using the `Object.defineProperty()` method to create a new property on the object: `Object.defineProperty(obj, 'k', { value: false });`

These alternatives may have different performance characteristics compared to the `delete` and `falsify` approaches.

Related benchmarks:

delete vs falsify (version: 0)

Comparing performance of: delete vs falsify

Created: 2 years ago by: Guest

Jump to the latest result

delete

falsify

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):