Benchmark: Object addition - checking for existence

Script Preparation code:

var obj = {
    "one": null,
    "two": null,
}

Tests:

Set New, No Check
obj["three"] = null;
Set New, Check
if (obj["three"] !== undefined) { obj["three"] = null; }
Set Existing, No Check
obj["two"] = null;
Set Existing, Check
if (obj["two"] !== undefined) { obj["two"] = null; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Set New, No Check
Set New, Check
Set Existing, No Check
Set Existing, Check

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/97.0.4692.71 Safari/537.36

Browser/OS: Chrome 97 on Windows

View result in a separate tab

Test name	Executions per second
Set New, No Check	14902280.0 Ops/sec
Set New, Check	3920521.5 Ops/sec
Set Existing, No Check	14100330.0 Ops/sec
Set Existing, Check	3964788.5 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and its options.

**Benchmark Overview**

The benchmark measures how fast different browsers can perform object addition operations with checks for existence. There are four test cases:

1. `Set New, No Check`: Sets a new property on an object without checking if it already exists.
2. `Set New, Check`: Sets a new property on an object while checking if the property already exists.
3. `Set Existing, No Check`: Sets an existing property of an object to null without checking if it already exists.
4. `Set Existing, Check`: Sets an existing property of an object to null while checking if the property already exists.

**Options Compared**

The options being compared are the two approaches for setting a new property on an object:

1. **Direct Assignment (`obj["three"] = null;`)**: This approach sets a new property directly without any checks.
2. **Property Check and Assignment (`if (obj["three"] !== undefined) { obj["three"] = null; }`)**: This approach first checks if the property exists before setting it to null.

**Pros and Cons of Each Approach**

1. **Direct Assignment (`obj["three"] = null;`)`:
	* Pros:
		+ Faster, as it directly sets the property without any checks.
	* Cons:
		+ May lead to unexpected behavior if the property does not exist.
2. **Property Check and Assignment (`if (obj["three"] !== undefined) { obj["three"] = null; }`)**:
	* Pros:
		+ Safer, as it prevents unexpected behavior by checking for existence before setting the property.
	* Cons:
		+ Slower, as it requires an additional check.

**Library and Special JS Feature**

There is no specific library mentioned in the benchmark. However, the `obj` object is used throughout all test cases, which suggests that it's a simple JavaScript object.

As for special JS features, there are none explicitly mentioned or used in this benchmark.

**Other Alternatives**

If you were to modify this benchmark to include additional options, some possible alternatives could be:

* Using a more complex data structure, such as an array or a nested object.
* Introducing random or varying inputs (e.g., different property names or values).
* Adding more browsers or devices to the test cases.
* Incorporating additional checks or optimizations (e.g., using `in` operator instead of bracket notation).

Keep in mind that these modifications would require careful consideration of the resulting benchmark's accuracy, relevance, and scalability.

Related benchmarks:

Object addition - checking for existence (version: 0)

Comparing performance of: Set New, No Check vs Set New, Check vs Set Existing, No Check vs Set Existing, Check

Created: 3 years ago by: Registered User

Jump to the latest result

Set New, No Check

Set New, Check

Set Existing, No Check

Set Existing, Check

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):