Run results for: python len vs cache

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

use len built-in

22/s

use variable to cache size

12/s

View exact numbers

Test name	Executions per second
✓ use len built-in	22 Ops/sec
use variable to cache size	12 Ops/sec

HTML Preparation code:

<script src='https://cdn.jsdelivr.net/pyodide/v0.26.3/full/pyodide.js'></script>

Script Preparation code:

async function globalMeasureThatScriptPrepareFunction() {
  	window.globalPyodide = await loadPyodide();
	await globalPyodide.runPython(`
		def test_len(n):
			arr = [0] * n
			for i in range(n):
				arr[i] = i
			return len(arr)

		def test_cache(n):
			arr = [0] * n
			l = 0
			for i in range(n):
				arr[i] = i
				l += 1
			return l

		def run(fct, n):
			for i in range(n):
				fct(n)
	`);    
}

Tests:

use len built-in
window.globalPyodide.runPython(` run(test_len, 1000) `);
use variable to cache size
window.globalPyodide.runPython(` run(test_cache, 1000) `);