Benchmark: Array split vs string substring3

Script Preparation code:

var s1 = "foo.bar";
var s2 = "foo";

Tests:

Array.split limit
var n1 = s1.split(".", 1)[0]; var n2 = s2.split(".", 1)[0];
Array.split
var n1 = s1.split(".")[0]; var n2 = s2.split(".")[0];
Substring
var n1 = s1.substring(0, s1.indexOf(".")); var n2 = s2.substring(0, s2.indexOf("."));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.split limit
Array.split
Substring

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4412.3 Safari/537.36

Browser/OS: Chrome 90 on Windows

View result in a separate tab

Test name	Executions per second
Array.split limit	988708.6 Ops/sec
Array.split	1459968.1 Ops/sec
Substring	1926277.0 Ops/sec

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

LLMs can make mistakes. Check important info.

The provided JSON represents a JavaScript microbenchmark created on MeasureThat.net. The benchmark compares the performance of three different approaches to split strings: using `Array.prototype.split()` with a limited number of occurrences (`split(limit)`) and without a limit (`split()`), and using the `String.prototype.substring()` method.

Let's break down each option:

1. **`Array.prototype.split()` with a limited number of occurrences**:
	* This approach splits the string into an array of substrings, where the maximum number of occurrences is specified by the second argument (in this case, 1).
	* Pros: This approach can be more efficient than using `String.prototype.substring()` because it avoids creating intermediate arrays.
	* Cons: The performance difference may be negligible for short strings or simple splits. Additionally, this approach requires more memory and CPU cycles to parse the string.
2. **`Array.prototype.split()` without a limit**:
	* This approach simply splits the string into an array of substrings, where each split is performed on every occurrence of the separator.
	* Pros: This approach can be faster than using `String.prototype.substring()` because it avoids the overhead of substring extraction and creation of intermediate arrays.
	* Cons: This approach may lead to better performance for longer strings or more complex splits, but at the cost of increased memory and CPU usage.
3. **`String.prototype.substring()`**:
	* This approach extracts a subset of characters from the string, starting from a specified position and ending at another specified position (or until the end of the string).
	* Pros: This approach is often simpler to implement than `Array.prototype.split()`, and it can be more efficient for short strings or simple substrings.
	* Cons: This approach can lead to slower performance for longer strings or complex substring extraction, as it involves multiple operations (position calculation, character access, etc.).

In the provided benchmark results, we see that:

* `Substring()` is the fastest option, with an average execution rate of 1459968.125 executions per second.
* `Array.split limit` is the slowest option, with an average execution rate of 988708.625 executions per second.
* `Array.split` falls in between, with an average execution rate of 1926277.0 executions per second.

Other alternatives to consider:

* **Regular expressions**: For more complex string manipulation tasks, regular expressions (using the `RegExp` constructor) can be a powerful tool. However, they are often slower than simple string operations.
* **String methods with callbacks**: Some modern JavaScript engines support callbacks for certain string methods, such as `String.prototype.replace()`. These callbacks allow you to perform more complex transformations on strings while still maintaining performance.
* **Native browser methods**: Modern browsers often provide native implementations of common string operations, such as `String.prototype.indexOf()` and `String.prototype.slice()`. These implementations are typically faster than their JavaScript counterparts.

In general, when choosing a method for splitting or manipulating strings, consider the trade-offs between speed, memory usage, and code complexity. For most use cases, simple string operations like `Substring()` will provide adequate performance, while more complex tasks may require the use of regular expressions or other specialized methods.

Related benchmarks:

Array split vs string substring3 (version: 0)

Comparing performance of: Array.split limit vs Array.split vs Substring

Created: 3 years ago by: Guest

Jump to the latest result

Array.split limit

Array.split

Substring

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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