Benchmark: if-check in loop vs two loops

Script Preparation code:

function useArray() {

    const array = [];

    for (let i = 0; i < 20; i++) {
        array.push(i);
    }
    return array;
}

Tests:

if-check in for-of; true
const array = useArray(); let count = ""; let active = true; const arrayB = [] for (const item of array) { arrayB.push(item); if (active) { count += item; } }
if-check outside of for-of; true
const array = useArray(); let count = ""; let active = true; const arrayB = [] for (const item of array) { arrayB.push(item); } if (active) { for (const item of array) { count += item; } }
if-check in for-of; false
const array = useArray(); let count = ""; let active = false; const arrayB = [] for (const item of array) { arrayB.push(item); if (active) { count += item; } }
if-check outside of for-of; false
const array = useArray(); let count = ""; let active = false; const arrayB = [] for (const item of array) { arrayB.push(item); } if (active) { for (const item of array) { count += item; } }
if-check in for-loop: true
const array = useArray(); let count = ""; let active = true; const arrayB = [] const limit = array.length; for (let i = 0; i < limit; i++) { const item = array[i]; arrayB.push(item); if (active) { count += item; } }
if-check outside of for-loop; true;
const array = useArray(); let count = ""; let active = true; const arrayB = [] const limit = array.length; for (let i = 0; i < limit; i++) { const item = array[i]; arrayB.push(item); } if (active) { const limit = array.length; for (let i = 0; i < limit; i++) { const item = array[i]; count += item; } }
if-check in for-loop; false
const array = useArray(); let count = ""; let active = false; const arrayB = [] const limit = array.length; for (let i = 0; i < limit; i++) { const item = array[i]; arrayB.push(item); if (active) { count += item; } }
if-check outside of for-loop; false
const array = useArray(); let count = ""; let active = false; const arrayB = [] const limit = array.length; for (let i = 0; i < limit; i++) { const item = array[i]; arrayB.push(item); } if (active) { const limit = array.length; for (let i = 0; i < limit; i++) { const item = array[i]; count += item; } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
if-check in for-of; true
if-check outside of for-of; true
if-check in for-of; false
if-check outside of for-of; false
if-check in for-loop: true
if-check outside of for-loop; true;
if-check in for-loop; false
if-check outside of for-loop; false

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):

LLMs can make mistakes. Check important info.

Based on the provided benchmark results, I can observe that there are two types of if checks being tested:

1. **if-check inside a for-loop**:
	* TestName: "if-check in for-loop; false"
	* Average executions per second: around 727-730 seconds
2. **if-check outside of a for-loop**:
	* TestName: "if-check outside of for-of; false" and "if-check outside of for-loop; false"
	* Average executions per second: lower than the in-for-loop test, ranging from 428-363 seconds

Comparing these results suggests that **checking conditions inside a for-loop tends to be faster**. However, I'd like to clarify that this is not explicitly stated by the benchmark results alone.

If we consider the results of the "if-check outside of for-of; true" and "if-check in for-of; true" tests, it appears that these cases are being optimized or executed more efficiently when the condition inside the if statement evaluates to `true`. This could be due to various reasons such as:

* The compiler is able to optimize the code further.
* The runtime environment has changed to provide a better performance.
* The test conditions were chosen to highlight differences in execution behavior.

In conclusion, while the results suggest that checking conditions inside a for-loop might be faster, it's essential to consider the broader context of the tests and potential biases.

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36

Browser/OS: Chrome 109 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
if-check in for-of; true	3636188.0 Ops/sec
if-check outside of for-of; true	3338492.5 Ops/sec
if-check in for-of; false	7263803.0 Ops/sec
if-check outside of for-of; false	7275218.5 Ops/sec
if-check in for-loop: true	4281429.5 Ops/sec
if-check outside of for-loop; true;	4186709.8 Ops/sec
if-check in for-loop; false	7632536.5 Ops/sec
if-check outside of for-loop; false	7271208.5 Ops/sec

Related benchmarks:

if-check in loop vs two loops (version: 0)

Comparing performance of: if-check in for-of; true vs if-check outside of for-of; true vs if-check in for-of; false vs if-check outside of for-of; false vs if-check in for-loop: true vs if-check outside of for-loop; true; vs if-check in for-loop; false vs if-check outside of for-loop; false

Created: one year ago by: Guest

Jump to the latest result

if-check in for-of; true

if-check outside of for-of; true

if-check in for-of; false

if-check outside of for-of; false

if-check in for-loop: true

if-check outside of for-loop; true;

if-check in for-loop; false

if-check outside of for-loop; false

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):