Benchmark: double negation x null render

Tests:

double negation
const value = 1; const isNumber = typeof value == 'number'; !!isNumber && value && console.log('test');
null check
const value = 1; const isNumber = typeof value == 'number'; isNumber && value ? console.log('test') : null;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
double negation
null check

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

I'd be happy to help you understand the provided benchmark.

**What is being tested?**

The two individual test cases are designed to measure the performance of JavaScript's conditional operator (also known as the ternary operator) and null checks.

The first test case, "double negation", tests how JavaScript handles a double negative expression. In this case, `!!isNumber && value` will evaluate to false if `value` is undefined or null, which can lead to unexpected behavior in some cases.

The second test case, "null check", tests how JavaScript handles a simple null check using the ternary operator: `isNumber && value ? console.log('test') : null`. This test ensures that the null check expression evaluates correctly even when `value` is null or undefined.

**Options compared**

In both test cases, we're comparing two different approaches:

1. Double negation (`!!isNumber && value`)
2. Null check using the ternary operator (`isNumber && value ? console.log('test') : null`)

The double negation approach can lead to unexpected behavior if `value` is undefined or null, while the null check approach ensures that the expression evaluates correctly in such cases.

**Pros and Cons of different approaches**

1. Double Negation:
	* Can be concise, but may lead to unexpected behavior if not used carefully.
	* May not work as expected when dealing with null or undefined values.
2. Null Check using Ternary Operator:
	* Ensures that the expression evaluates correctly even when `value` is null or undefined.
	* Can be slightly less concise than the double negation approach.

**Libraries and Features**

None of the provided test cases use any libraries, but they do utilize JavaScript's built-in features:

1. The ternary operator (conditional expression).
2. Null checks using the `typeof` operator and the null coalescing operator (`??`).

Note that there are other ways to write a null check in JavaScript, such as using an if-else statement or the optional chaining operator (`?.`).

**Alternatives**

If you're interested in exploring alternative approaches for testing conditional expressions or null checks, here are some options:

1. Use a testing framework like Jest or Mocha to write unit tests for your code.
2. Utilize ES6's `optional chaining operator` (`?.`) for null-safe property access: `obj?.prop`.
3. Implement a custom null check function using `if` statements or `switch` statements.

Keep in mind that the specific approach you choose will depend on your project's requirements, performance constraints, and coding style preferences.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 116 on Android

View result in a separate tab

Test name	Executions per second
double negation	79471.3 Ops/sec
null check	80311.0 Ops/sec

Related benchmarks:

double negation x null render (version: 0)

Comparing performance of: double negation vs null check

Created: 2 years ago by: Guest

Jump to the latest result

double negation

null check

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):