Benchmark: Array split vs string substring5

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("."));
Array.split regex limit
var n1 = s1.split(/\./, 1)[0]; var n2 = s2.split(/\./, 1)[0];
Array.split regex
var n1 = s1.split(/\./)[0]; var n2 = s2.split(/\./)[0];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

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

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/88.0.4324.192 Safari/537.36

Browser/OS: Chrome 88 on Windows

View result in a separate tab

Test name	Executions per second
Array.split limit	952896.8 Ops/sec
Array.split	1403643.5 Ops/sec
Substring	1908942.0 Ops/sec
Array.split regex limit	2204619.0 Ops/sec
Array.split regex	2056322.5 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 test case on MeasureThat.net. The test measures the performance of three different string manipulation methods: `Array.split`, `Substring`, and `Array.split` with regular expressions.

Here's an explanation of what each method is tested:

1. **Array.split**: This method splits a string into an array of substrings using a specified separator. In this test, the separator is set to `"."`. The `split()` method returns an array where each element is a substring of the original string.
2. **Substring**: This method extracts a subset of characters from a string, starting from a specified position and ending at a specified length. In this test, the start position is set to 0 (the beginning of the string) and the end position is set to the index of the first occurrence of `"."` in the string.
3. **Array.split regex**: This method splits a string into an array of substrings using a regular expression as the separator. In this test, the regular expression `"/\\./"` matches both literal periods (`"."`) and escaped periods (`"\\."`). The `split()` method returns an array where each element is a substring of the original string.

Now, let's discuss the pros and cons of each approach:

* **Array.split**: This method can be faster than the other two methods for certain use cases, especially when dealing with large strings. However, it has some limitations:
	+ It only splits on a specific separator, which may not be ideal if you need to split on multiple delimiters.
	+ It returns an array of substrings, which can require additional processing to work with.
* **Substring**: This method is simpler and more straightforward than `Array.split`, but it has some limitations:
	+ It only extracts a subset of characters from the original string, rather than splitting the string into separate substrings.
	+ It may not be as efficient as `Array.split` for very large strings.
* **Array.split regex**: This method offers flexibility and power, as you can use any regular expression to split the string. However:
	+ Regular expressions can be complex and difficult to read, which can make it harder to understand and maintain the code.
	+ They may have a performance overhead compared to `Array.split` or `Substring`.

The latest benchmark results show that:

* **Array.split regex** is the fastest method for splitting on literal periods (`"."`) in the input strings.
* **Substring** is slower than both `Array.split` and `Array.split regex`, but still relatively fast due to its simplicity.
* **Array.split** is faster than `Substring` but slower than `Array.split regex`.

Other alternatives that could be considered for string manipulation include:

* Using `String.prototype.replace()` with a regular expression to replace all occurrences of a substring with an empty string, effectively splitting the string into substrings.
* Using `String.prototype.replaceAll()` (supported in ECMAScript 2020 and later) or third-party libraries like `lodash` to split strings using regex patterns.

However, these alternatives may not be as efficient or straightforward as the methods tested in this benchmark.

Related benchmarks:

Array split vs string substring5 (version: 0)

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

Created: 3 years ago by: Guest

Jump to the latest result

Array.split limit

Array.split

Substring

Array.split regex limit

Array.split regex

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):