Benchmark: for vs foreach - MeasureThat.net

Script Preparation code:

var owners = ["rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan","rob","steve","mark", "dave", "alan",
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var rtnText = "";

Tests:

foreach
for (var owner in owners) { if (owners.hasOwnProperty(owner)) { rtnText += owner + ", "; } }
for
for (var i = 0; i < owners.length; i++) { rtnText += owners[i] + ", "; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
foreach
for

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

It appears that this is not a typical programming question, but rather a test case for benchmarking JavaScript code.

Given the information provided, I'll attempt to answer based on my understanding of the data:

**Question:** What is the expected output or result when running the following benchmarks?

**Benchmark Definitions:**

1. `for (var owner in owners) { ... }` (foreach loop)
2. `for (var i = 0; i < owners.length; i++) { ... }` (traditional for loop)

**Input Data:**

* `owners`: an array of strings, repeated multiple times (`"dave", "alan", "rob", "steve", "mark"`)

Based on my analysis:

1. The `foreach` loop will iterate over the `owners` array and concatenate each value to a string using commas as separators.
2. The traditional `for` loop will also iterate over the `owners` array and concatenate each value to a string using commas as separators.

Since both loops will produce the same output, I would expect the results to be:

* Both benchmarks should execute at approximately the same speed.
* The resulting `rtnText` variable should contain all the values from the `owners` array, separated by commas (e.g., `"dave, alan, rob, steve, mark"`).

Please note that this is an educated guess based on my understanding of JavaScript and benchmarking. Without seeing the actual code or execution results, it's difficult to provide a definitive answer.

Latest run results:

Run details: (Test run date: 7 years ago)

User agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36

Browser/OS: Chrome 54 on Windows 7

View result in a separate tab

Test name	Executions per second
foreach	685.4 Ops/sec
for	652.7 Ops/sec

Related benchmarks:

for vs foreach (version: 4)

Comparing performance of: foreach vs for

Created: 8 years ago by: Registered User

Jump to the latest result

foreach

for

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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