Benchmark: undefined tests - MeasureThat.net

Tests:

typeof false !== "undefined"
typeof false !== "undefined"
false !== undefined
false !== undefined

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
typeof false !== "undefined"
false !== undefined

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

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

**Benchmark Purpose**

The benchmark measures the performance difference between two JavaScript expressions: `typeof false !== "undefined"` and `false !== undefined`. The purpose of this benchmark is to compare how fast each expression can be evaluated in different browsers.

**Options Compared**

There are only two options being compared:

1. `typeof false !== "undefined"`
2. `false !== undefined`

**Pros and Cons of Each Approach**

**1. Using `typeof`**

* Pros:
	+ More explicit and clear code
	+ Easier to read and maintain
* Cons:
	+ May be slower due to the need to look up the type of a variable using `typeof`
	+ Some browsers may optimize this check, making it faster

**2. Without `typeof`**

* Pros:
	+ Can be faster since there's no lookup required for variable types
	+ May be less optimized by some browsers
* Cons:
	+ Less explicit and more ambiguous code (it's not immediately clear what the expression is doing)
	+ Requires careful consideration of the type of the `false` value

**Library Used**

There isn't a specific library mentioned in the provided benchmark. However, `typeof` is a built-in JavaScript operator that returns the type of a variable.

**Special JS Features or Syntax**

No special features or syntax are being used in this benchmark.

**Other Alternatives**

If you were to rewrite this benchmark, alternative options might include:

* Using a more modern approach with arrow functions and template literals (e.g., `false?.toString() !== undefined`)
* Comparing different comparison operators (e.g., `===`, `!=`, etc.)
* Adding additional variables or conditions to the expressions

Keep in mind that any changes to the benchmark would need to be thoroughly tested to ensure accurate results.

**Benchmark Preparation Code**

The provided "Script Preparation Code" and "Html Preparation Code" fields are empty, suggesting that this benchmark does not require any setup code beyond what's included in the `Benchmark Definition` JSON.

Latest run results:

Run details: (Test run date: 9 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Browser/OS: Chrome 122 on Windows

View result in a separate tab

Test name	Executions per second
typeof false !== "undefined"	237677616.0 Ops/sec
false !== undefined	18702544.0 Ops/sec

Related benchmarks:

undefined tests (version: 0)

Comparing performance of: typeof false !== "undefined" vs false !== undefined

Created: 9 months ago by: Registered User

Jump to the latest result

typeof false !== "undefined"

false !== undefined

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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