Benchmark: if positive or negative test

Tests:

positive først (9/10 sjanse for else)
const data = [1,2,3,4,5,6,7,8,9,10]; const id = 2; for (let d of data) { if (d === id) { // something } else { // something else } }
negative først (1/10 sjanse for else)
const data = [1,2,3,4,5,6,7,8,9,10]; const id = 2; for (let d of data) { if (d !== id) { // something } else { // something else } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
positive først (9/10 sjanse for else)
negative først (1/10 sjanse for else)

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'll break down the provided benchmark definition and test cases to explain what's being tested, the options compared, pros and cons of each approach, and other considerations.

**Benchmark Definition**

The benchmark definition is a JSON object that represents the script to be executed in the browser. It contains:

* `Name`: The name of the test case (e.g., "positive først" or "negative først")
* `Description`: None
* `Script Preparation Code`: None
* `Html Preparation Code`: None

The only relevant information is the `Benchmark Definition` script, which is a simple for loop that checks if an element in the `data` array matches the value of the `id` constant. The script has two variations:

1. Positive first (9/10 chances for else)
2. Negative first (1/10 chances for else)

**Individual Test Cases**

There are two test cases, each with its own benchmark definition:

1. **Positive First**
```javascript
for (let d of data) {
  if (d === id) {
    // something
  }
  else {
    // something else
  }
}
```
This script checks if the current element in the `data` array matches the value of the `id` constant. If it does, it executes a block of code; otherwise, it executes another block of code.

2. **Negative First**
```javascript
for (let d of data) {
  if (d !== id) {
    // something
  }
  else {
    // something else
  }
}
```
This script checks if the current element in the `data` array does not match the value of the `id` constant. If it doesn't, it executes a block of code; otherwise, it executes another block of code.

**Comparison of Options**

The two test cases differ only in the condition used to determine which branch of the loop to execute:

1. Positive First: `d === id`
2. Negative First: `d !== id`

In terms of performance, there is no inherent difference between these two approaches. However, in practice, the performance difference might be negligible unless the loop iterates over a very large dataset.

**Pros and Cons of Each Approach**

* **Positive First (9/10 chances for else)**
	+ Pros:
		- May be slightly faster due to early exit
	+ Cons:
		- Might lead to more branches being executed, potentially increasing overhead
* **Negative First (1/10 chances for else)**
	+ Pros:
		- Could reduce branching overhead by executing fewer blocks of code
	+ Cons:
		- May result in more function calls or other expensive operations due to the additional branch

**Library and Special JS Features**

Neither test case explicitly uses a library or special JavaScript features.

**Other Considerations**

When writing benchmarking scripts, it's essential to keep the following considerations in mind:

* Minimize unnecessary overhead (e.g., using `const` instead of `var`)
* Avoid using complex logic that might lead to branch prediction errors
* Ensure the script is representative of real-world usage

In this case, both test cases are relatively simple and do not introduce any libraries or special JavaScript features. The benchmarking result will provide insight into which approach performs better in terms of performance.

**Alternatives**

If you're interested in exploring alternative approaches, consider the following:

* Use a different programming paradigm (e.g., imperative vs. functional)
* Experiment with other data structures (e.g., arrays vs. linked lists)
* Investigate optimizations specific to your target browser or platform
* Compare the performance of different loop unrolling techniques

Latest run results:

Run details: (Test run date: 7 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.75 Safari/537.36 OPR/42.0.2393.85

Browser/OS: Opera 42 on Windows

View result in a separate tab

Test name	Executions per second
positive først (9/10 sjanse for else)	1662827.8 Ops/sec
negative først (1/10 sjanse for else)	1652870.5 Ops/sec

Related benchmarks:

if positive or negative test (version: 0)

Comparing performance of: positive først (9/10 sjanse for else) vs negative først (1/10 sjanse for else)

Created: 7 years ago by: Guest

Jump to the latest result

positive først (9/10 sjanse for else)

negative først (1/10 sjanse for else)

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):