Benchmark: while vs do while

Tests:

while
let maxRuns = 1000; while(maxRuns > 0) { const blah = 1; maxRuns -= 1; }
do while
let maxRuns = 1000; do { maxRuns -= 1; const blah = 1; } while (maxRuns > 0);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
while
do while

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.0.0 Safari/537.36

Browser/OS: Chrome 102 on Windows

View result in a separate tab

Test name	Executions per second
while	3629190.2 Ops/sec
do while	1399821.5 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 help explain the provided benchmark.

**Overview**

The benchmark is designed to compare the performance of two different loops: `while` and `do-while`. The test creates 10,000 iterations of each loop, and measures how many executions per second are achieved by each browser on a desktop device running Windows 10.

**Options Compared**

There are only two options being compared:

1. **While Loop**: A traditional `while` loop that checks the condition at the beginning of each iteration.
2. **Do-While Loop**: A `do-while` loop that executes the body of the loop once, and then checks the condition before executing the next iteration.

**Pros and Cons**

**While Loop**

Pros:

* Easy to read and understand
* Allows for more control over the loop's behavior

Cons:

* Can lead to inefficient use of CPU resources if the condition is checked frequently
* May cause unnecessary iterations if the condition is false

**Do-While Loop**

Pros:

* Ensures that the body of the loop is executed at least once
* Can improve performance in some cases, since the condition is only checked after the first iteration

Cons:

* Can make the code harder to read and understand for beginners
* May lead to unexpected behavior if the initial condition is false

**Library**

In this benchmark, no external libraries are being used. The test only involves vanilla JavaScript.

**Special JS Features or Syntax**

There are no special features or syntax in this benchmark that would require additional explanation.

**Other Considerations**

When writing loops like these, it's essential to consider the following:

* Avoid using `while` loops when possible, as they can lead to unnecessary iterations.
* Use `do-while` loops only when necessary, and make sure to understand their behavior.
* Always profile and test your code to determine which approach is best for a specific use case.

**Alternatives**

Other alternatives for comparing loop performance might include:

* **For Loops**: While not directly comparable to `while` and `do-while` loops, `for` loops can also be used to execute iterations. However, this benchmark focuses on the difference between two types of loops.
* **Loop Unrolling**: This technique involves unrolling the loop to reduce the number of iterations. However, it may not be as relevant in modern JavaScript engines that optimize loop performance.
* **Loop Parallelization**: Some modern browsers and frameworks support parallelizing loops to take advantage of multi-core processors. However, this feature is not included in this benchmark.

Keep in mind that these alternatives are outside the scope of this specific benchmark, which focuses on comparing `while` and `do-while` loops.

Related benchmarks:

while vs do while (version: 0)

Comparing performance of: while vs do while

Created: one year ago by: Guest

Jump to the latest result

while

do while

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):