Benchmark: Negation vs normal boolean value

Script Preparation code:

x = false;

Tests:

!!x
return !!x;
x
return x;
x === false
return x === false;
booooo
return x == false;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
!!x
x
x === false
booooo

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 5 years ago)

User agent: Mozilla/5.0 (X11; Fedora; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36

Browser/OS: Chrome 75 on Fedora

View result in a separate tab

Test name	Executions per second
!!x	5111261.5 Ops/sec
x	5176799.0 Ops/sec
x === false	5080040.5 Ops/sec
booooo	4739077.5 Ops/sec

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

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

This benchmark compares the performance of different ways to test for falsey values in JavaScript. The tests are designed to measure which approach is faster, more efficient, and more consistent across various browsers and devices.

**Benchmark Definition JSON Explanation**

The provided JSON defines a benchmark with the following properties:

* `Name`: A human-readable name for the benchmark.
* `Description`: An optional description of the benchmark, but in this case, it's empty.
* `Script Preparation Code`: A JavaScript code snippet that prepares the test environment. In this case, it sets the variable `x` to `false`.
* `Html Preparation Code`: Another optional field, which is also empty in this example.

**Individual Test Cases**

The benchmark consists of four individual test cases:

1. `!!x`
2. `x`
3. `x === false`
4. `booooo`

These tests aim to measure the performance of different ways to check if a value is falsey.

**Library and Special JS Features**

None of these test cases use any specific libraries or features. They are designed to be simple, concise, and representative of common JavaScript use cases.

**Options Compared**

The benchmark compares four options:

1. `!!x` (noticing that the boolean value)
2. `x` (simply accessing the variable)
3. `x === false` (using a strict equality check)
4. `booooo` (a seemingly unrelated and incorrect test case, likely for testing purposes)

**Pros and Cons of Each Approach**

Here's a brief analysis of each approach:

1. `!!x`: This method uses a boolean NOT operator (`!`) to invert the value of `x`. It's concise and easy to read, but may incur additional overhead due to the unnecessary inversion.
2. `x`: Directly accessing the variable is simple and efficient. However, it assumes that `x` has already been initialized, which might not be the case in all scenarios.
3. `x === false`: This approach uses a strict equality check, which can be useful when you want to ensure that the value is exactly equal to `false`. However, it may incur additional overhead due to the comparison operation.
4. `booooo`: This test case seems unrelated and might be used for testing purposes only. It's likely not intended to represent a real-world scenario.

**Other Considerations**

When writing benchmarks like this one, it's essential to consider factors such as:

* Code readability and maintainability
* Variable initialization and scope
* Browser-specific optimizations or quirks
* Consistency across different test cases

**Alternatives**

If you're looking for alternatives to MeasureThat.net, some other popular benchmarking tools and platforms include:

* JSPerf (now deprecated)
* Google Chrome's Benchmarking Tool
* Node.js Performance Benchmarks
* BenchmarkJS
* Benchmarking libraries like benchmark-debts or fast-bench

Keep in mind that each tool has its strengths and weaknesses, and the choice ultimately depends on your specific needs and use cases.

Related benchmarks:

Negation vs normal boolean value (version: 1)

Comparing performance of: !!x vs x vs x === false vs booooo

Created: 5 years ago by: Registered User

Jump to the latest result

!!x

x

x === false

booooo

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):