Benchmark: For Loop Approaches

Script Preparation code:

num = i => i * 19 - 3

Tests:

for loop - (initialize counter above)
let i = 0; const length = 1000; for(i; i < length; i++) { return num(i); };
for loop - (inline initialized counter)
const length = 1000; for(i; i < length; i++) { return num(i); };
for loop - (i += 1)
let i = 0; const length = 1000; for(i; i < length; i += 1) { return num(i); };

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for loop - (initialize counter above)
for loop - (inline initialized counter)
for loop - (i += 1)

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.132 Safari/537.36

Browser/OS: Chrome 76 on Mac OS X 10.14.6

View result in a separate tab

Test name	Executions per second
for loop - (initialize counter above)	9338534.0 Ops/sec
for loop - (inline initialized counter)	9343960.0 Ops/sec
for loop - (i += 1)	9247808.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and the pros/cons of each approach.

**Benchmark Definition**
The benchmark is defined in JSON format and represents two different approaches to testing for loops:

1. **For Loop Approaches**

This benchmark compares three variations of for loop implementations:

a. **Initialize counter above**: The loop counter (`i`) is initialized before the loop, outside the loop.
b. **Inline initialized counter**: The loop counter (`i`) is initialized directly inside the loop condition.
c. **Increment by 1**: The loop counter (`i`) increments by 1 in each iteration.

**Options Compared**

The benchmark compares the performance of these three for loop approaches:

* Initialize counter above: `let i = 0;` and `const length = 1000;`
* Inline initialized counter: No explicit initialization, just `for(i; i < length; i++) { ... }`
* Increment by 1: `for(i; i < length; i += 1) { ... }`

**Pros and Cons of Each Approach**

1. **Initialize Counter Above**
	* Pros:
		+ Easy to read and maintain, as the counter is isolated from the loop condition.
		+ Can be useful in cases where the counter needs to be reused elsewhere in the code.
	* Cons:
		+ May incur a slight overhead due to the extra variable initialization.
2. **Inline Initialized Counter**
	* Pros:
		+ Eliminates the need for an extra variable, reducing memory usage and potential issues with scope.
	* Cons:
		+ Can make the code harder to read and understand, as the counter is tightly coupled with the loop condition.
3. **Increment by 1**
	* Pros:
		+ Simplifies the loop syntax and reduces the number of variables required.
	* Cons:
		+ May lead to issues if not used carefully, as incrementing by 1 can affect the loop's behavior.

**Library Usage**

There is no explicit library mentioned in the benchmark. However, some JavaScript engines might have internal optimizations or features that could impact the performance of these for loops (e.g., tail call optimization, loop unrolling).

**Special JS Features**

None are mentioned explicitly in this benchmark.

**Alternatives**

Other approaches to testing for loops could include:

* Using a different language, such as C++ or Rust
* Implementing a hybrid approach that combines elements from each of the above methods
* Using a profiling tool to identify performance bottlenecks and optimize the code accordingly

Overall, the benchmark provides a simple and focused test case for comparing the performance of three common for loop approaches. By using a standardized format and providing clear pros and cons for each approach, it helps users understand the trade-offs involved in choosing the most efficient implementation.

Related benchmarks:

For Loop Approaches (version: 0)

Comparing performance of: for loop - (initialize counter above) vs for loop - (inline initialized counter) vs for loop - (i += 1)

Created: 5 years ago by: Guest

Jump to the latest result

for loop - (initialize counter above)

for loop - (inline initialized counter)

for loop - (i += 1)

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):