Benchmark: Split vs substring: parse string of many values

Script Preparation code:

var s1 = "foo bar test hello goodbye george sally blue";
var s2 = "stuff shoes charge top bottom pink salt";

Tests:

Split
var n1 = s1.split(" "); var n2 = s2.split(" ");
Substring
function fastSplit(string) { let result = []; let startingIndex = 0; for (var i = 0; i < string.length; i++) { if (string[i] === " ") { result.push(string.substring(startingIndex, i).trim()); startingIndex = i; } } return result; } var n1 = fastSplit(s1); var n2 = fastSplit(s2);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Split
Substring

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

I'll explain the benchmark in detail.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmark on MeasureThat.net, which compares two approaches to parse a string of many values separated by spaces: `Array.split()` and custom implementation using a loop (`Substring`). The test evaluates the performance of these two methods on different browsers and devices.

**Options Being Compared**

Two options are being compared:

1. **Array.split()**: A built-in JavaScript method that splits a string into an array of substrings based on a specified separator (in this case, spaces). This approach is concise but may have limitations in terms of performance or flexibility.
2. **Custom implementation using a loop (`Substring`)**: A custom solution implemented as a function `fastSplit()` that iterates through the input string and pushes each substring to an array. This approach provides more control over the parsing process but requires more code and may be slower due to the overhead of function calls.

**Pros and Cons**

**Array.split():**

Pros:

* Concise and easy to implement
* Built-in method, so it's likely to be optimized for performance

Cons:

* Limited flexibility (e.g., no support for custom separators)
* May not perform well with very large input strings or specific edge cases

**Custom implementation using a loop (`Substring`):**

Pros:

* More control over the parsing process
* Can handle custom separators and edge cases

Cons:

* Requires more code, which can lead to overhead and slower performance
* May not be optimized for performance compared to built-in methods like `Array.split()`

**Other Considerations**

* **Browser support**: The benchmark results show that both approaches perform similarly on Firefox 89, but it's essential to ensure that the custom implementation is compatible with other browsers.
* **Device platform**: The test uses a desktop device, which may not accurately represent the performance characteristics of mobile devices or other platforms.

**Library Usage**

None of the provided code snippets use external libraries, so there are no additional dependencies to consider.

**Special JavaScript Feature/Syntax**

The custom implementation `fastSplit()` uses a few advanced JavaScript features:

* **Variable scope**: The `startingIndex` variable is declared within the loop, which ensures it's scoped correctly.
* **Function declaration**: The `fastSplit()` function is declared using the `function` keyword, which allows for block-level declarations.
* **Conditional statements**: The code uses an `if-else` statement to handle whitespace separation.

Overall, the benchmark provides a useful comparison of two approaches to parsing strings in JavaScript. By understanding the pros and cons of each method, developers can choose the most suitable solution for their specific use case and optimize their code for better performance.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:89.0) Gecko/20100101 Firefox/89.0

Browser/OS: Firefox 89 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
Split	1775046.9 Ops/sec
Substring	848834.2 Ops/sec

Related benchmarks:

Split vs substring: parse string of many values (version: 0)

Array split vs string substring: parse string of many values separated by spaces

Comparing performance of: Split vs Substring

Created: 3 years ago by: Registered User

Jump to the latest result

Split

Substring

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):