Benchmark: split vs for loop 2

HTML Preparation code:

<script>

var s="Since all three methods have roughly equivalent performance, my preference is to use slice. It supports extracting from the end of the string and I feel that returning an empty string when start index > stop follows the principle of least surprise better than substring's swapping of parameters. I avoid substr because of the browser inconsistency.";
var d=" ";
  

</script>

Tests:

split
var a=s.split(d); var i,l=a.length,w; for(i=0;i<l;i++){ w=a[i]; };
for loop
var i,l=s.length,w,lsp=-1; for(i=0;i<l;i++){ if(s.charAt(i) == d){ w=s.slice(lsp+1,i); lsp=i } };

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
split
for loop

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.4951.67 Safari/537.36

Browser/OS: Chrome 101 on Windows

View result in a separate tab

Test name	Executions per second
split	1835794.0 Ops/sec
for loop	7551.7 Ops/sec

Autogenerated LLM Summary (model gemma2:9b, generated 2 months ago):

LLMs can make mistakes. Check important info.

This benchmark on MeasureThat.net compares two approaches to splitting a string: using the `split()` method and iterating through it with a `for` loop.

Let's break down each approach:

**1. `split()` Method:** This method directly splits the string based on a delimiter (in this case, a space " "). It returns an array of substrings. The code snippet for this test case simply calls `s.split(d)` and then iterates through the resulting array using a `for` loop to process each substring.

**Pros:**
* **Concise:**  It's very short and easy to understand.
* **Potentially Faster:**  JavaScript engines are often optimized for built-in methods like `split()`, so it might be faster than manually implementing the logic.

**Cons:**
* **Memory Usage:** Depending on the size of the input string and the frequency of delimiters, `split()` can create a potentially large array in memory.

**2. `for` Loop with `slice()`:** This approach manually iterates through the string character by character using a `for` loop.  It uses `slice()` to extract substrings based on the delimiter positions.

**Pros:**
* **Fine-grained Control:** You have more control over how substrings are extracted and processed.
* **Potentially Lower Memory Usage:** If you only need to process substrings one at a time, this method might use less memory than `split()`.

**Cons:**
* **More Complex:** It requires more code compared to using `split()`. 
* **Potential for Errors:** Manually handling string manipulation can be prone to errors if not carefully implemented.

**Alternatives:**

Besides these two methods, you could consider:

* **Regular Expressions:**  For more complex splitting patterns, regular expressions (`RegExp`) provide powerful tools. However, they can sometimes have performance overhead.
* **Streaming Libraries:** If you're dealing with very large strings, streaming libraries can process the data in chunks, reducing memory usage.

**Key Considerations When Choosing a Method:**

* **String Size and Delimiter Frequency:**  For short strings or infrequent delimiters, `split()` might be sufficient. For longer strings or frequent delimiters, a manual approach might be more efficient.
* **Memory Constraints:** If memory usage is a concern, consider the potential impact of creating an array with `split()`.

Let me know if you'd like to explore any of these options in more detail!

Related benchmarks:

split vs for loop 2 (version: 0)

Comparing performance of: split vs for loop

Created: 4 years ago by: Guest

Jump to the latest result

split

for loop

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gemma2:9b, generated 2 months ago):