Benchmark: Array iteration for while etc

Script Preparation code:

var testArray = new Array(1024);
var sum = 0;

Tests:

Simple for
for (var c=0; c<testArray.length; c++) { sum += c; }
While
var c = 0; while (c<testArray.length) { sum += c; c++; }
While + 1
var c = 0; while (c<testArray.length) { sum += c; c += 1; }
For +1
for (var c=0; c<testArray.length; c+=1) { sum += c; }
Reverse for
for (var c=testArray.length; c>0; c--) { sum += c; }
Cached for
var length = testArray.length; for (var c = 0; c<length;c++) { sum += c; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Simple for
While
While + 1
For +1
Reverse for
Cached for

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):

LLMs can make mistakes. Check important info.

Let's break down the benchmark and explain what is being tested.

**Benchmark Definition**
The provided JSON represents a JavaScript microbenchmark created using MeasureThat.net. The benchmark defines two types of loops: `for`, `while`, and their variations (`+1` and `Reverse for`). These loops are used to iterate over an array of 1024 elements, performing a simple arithmetic operation (adding the index to a running total).

**Options Compared**
The test cases compare different approaches to loop iteration:

1. **Simple for**: A traditional `for` loop with increment (`c++`).
2. **While**: A `while` loop with post-increment (`c++`).
3. **While + 1**: A `while` loop with pre-increment (`c += 1`).
4. **Reverse for**: A `for` loop with reverse iteration ( decrementing the index).
5. **Cached for**: A `for` loop with a cached iteration variable.

**Pros and Cons of Each Approach**

1. **Simple for**: Pros: easy to read and write, predictable behavior. Cons: may have overhead due to increment operation.
2. **While**: Pros: flexible, can be used in situations where the loop counter is not known beforehand. Cons: can lead to infinite loops if not properly controlled.
3. **While + 1**: Similar to `while`, but with a more concise syntax. Can be beneficial for performance-critical code.
4. **Reverse for**: Pros: efficient for large arrays, as it avoids the need for index increment/decrement operations. Cons: may require additional memory to store the index variable.
5. **Cached for**: Pros: can improve performance by avoiding unnecessary array accesses, but requires careful handling of the cache variable.

**Library Used**
None is explicitly mentioned in the provided JSON.

**Special JS Feature/Syntax**
The test cases use standard JavaScript features and syntax. There are no special or experimental features used in this benchmark.

**Other Considerations**

* The benchmark uses a fixed-size array to ensure consistent results across different browsers and environments.
* The tests are designed to be independent, allowing for accurate comparisons between the loop iterations.
* MeasureThat.net provides detailed statistics, including executions per second, which can help identify performance bottlenecks in code.

**Alternatives**
If you're interested in exploring alternative approaches or optimizing your own microbenchmarking efforts, consider using libraries like:

* `Benchmark.js`: A popular benchmarking library for Node.js and modern web browsers.
* `jsperf`: A benchmarking tool specifically designed for JavaScript development.
* `Google's Benchmark`: A lightweight benchmarking library developed by Google engineers.

These alternatives offer a range of features and options to suit different use cases, from simple loop benchmarks to more complex, multi-threaded tests.

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.80 Safari/537.36

Browser/OS: Chrome 75 on Windows

View result in a separate tab

Test name	Executions per second
Simple for	3425.3 Ops/sec
While	3380.1 Ops/sec
While + 1	3494.2 Ops/sec
For +1	3383.6 Ops/sec
Reverse for	4596.5 Ops/sec
Cached for	4676.5 Ops/sec

Related benchmarks:

Array iteration for while etc (version: 0)

Comparing performance of: Simple for vs While vs While + 1 vs For +1 vs Reverse for vs Cached for

Created: 5 years ago by: Guest

Jump to the latest result

Simple for

While

While + 1

For +1

Reverse for

Cached for

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 29 days ago):