Benchmark: negation vs compare performance

Tests:

negation
for(let i=0; i < 100000;i++){ let x = !!i; }
compare
for(let i=0; i < 100000;i++){ let x = i != 0; }
compare strict
for(let i=0; i < 100000;i++){ let x = i !== 0; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
negation
compare
compare strict

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.83 Safari/537.36

Browser/OS: Chrome 99 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
negation	31509.2 Ops/sec
compare	31599.7 Ops/sec
compare strict	31535.9 Ops/sec

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

LLMs can make mistakes. Check important info.

I'd be happy to explain the JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Overview**

The provided benchmark compares the performance of three different approaches for evaluating conditional expressions in a `for` loop:

1. **Negation (`!!i`)**
2. **Comparison using `!=`**
3. **Comparison using `!==` (strict)**

These approaches are used to evaluate the condition `i != 0` or `i !== 0`, which is equivalent to checking if `i` is not equal to 0.

**Library and Syntax Considerations**

In this benchmark, no special JavaScript libraries or features are required. The benchmark tests the performance of these three basic comparison operators.

However, it's worth noting that in modern JavaScript, you can also use the optional chaining operator (`?.`) or the nullish coalescing operator (`??`), which could potentially be used to evaluate conditional expressions similar to `!!i`, `!=`, and `!==`. But in this specific benchmark, these features are not used.

**Comparison Operators**

The three comparison operators being tested have different performance characteristics:

1. **Negation (`!!i`)**: This operator is equivalent to a single operation that checks if `i` is falsy (e.g., 0, null, undefined). In modern browsers, this is the fastest approach.
2. **Comparison using `!=`**: This operator performs a comparison between `i` and 0, which is slower than negation since it involves an additional operation.
3. **Comparison using `!==` (strict)**: Similar to `!=`, but with strict equality, which may introduce additional overhead due to the need for a separate check for `NaN` (not a number).

**Performance Trade-Offs**

The performance trade-offs between these three approaches are:

* **Negation (`!!i`)**: Fastest, but uses an additional operation.
* **Comparison using `!=`**: Slower than negation due to the extra comparison operation.
* **Comparison using `!==` (strict)**: May be slower than both negation and `!=` due to the additional checks.

**Alternatives**

For similar benchmarking tasks, you may want to consider other JavaScript microbenchmarks or testing frameworks that allow you to compare performance characteristics of different operators or functions. Some alternatives include:

* **JavaScript Performance Comparison**: A website that allows you to compare the performance of various JavaScript operations.
* **Benchmark.js**: A popular benchmarking library for Node.js and browsers that provides a simple way to write and run benchmarks.
* **jsperf**: An older, but still widely used, benchmarking tool for JavaScript.

Keep in mind that these alternatives may have different use cases and requirements than MeasureThat.net.

Related benchmarks:

negation vs compare performance (version: 0)

Comparing performance of: negation vs compare vs compare strict

Created: 3 years ago by: Guest

Jump to the latest result

negation

compare

compare strict

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):