Benchmark: Array split vs string substring4

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	945965.1 Ops/sec
Array.split	1339981.4 Ops/sec
Substring	1898478.2 Ops/sec
Array.split regex limit	2235229.0 Ops/sec
Array.split regex	1327890.1 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the benchmark and explain what is being tested.

The provided JSON represents a microbenchmark test case on MeasureThat.net, which compares different approaches to split strings in JavaScript.

**Benchmark Definition:**

* The script preparation code defines two input strings: `s1 = "foo.bar"` and `s2 = "foo"`.
* The benchmark focuses on splitting these strings using various methods.

**Methods being compared:**

1. **Array.split**: This method splits a string into an array of substrings, separating them by a specified delimiter (in this case, the dot `.`).
	* Pros:
		+ Can handle multiple delimiters.
		+ Returns an array, which can be useful for further processing.
	* Cons:
		+ May not be as efficient as other methods for simple string splitting.
2. **Array.split regex**: This method splits a string into an array of substrings using a regular expression (regex) pattern.
	* Pros:
		+ Can handle complex patterns, including multiple delimiters and special characters.
	* Cons:
		+ May be slower than other methods due to the overhead of compiling and executing the regex pattern.
3. **Substring**: This method returns a new string that starts at a specified index and ends at another specified index (exclusive).
	* Pros:
		+ Can be more efficient for simple string splitting, as it only extracts a single substring.
	* Cons:
		+ May not be suitable for strings with multiple delimiters or complex patterns.

**Library usage:**

In this benchmark, no libraries are explicitly mentioned. However, the use of `Array.split` and `Array.split regex` methods implies that the JavaScript engine is using internal array manipulation functions under the hood.

**Special JS feature/syntax:**

This benchmark does not appear to utilize any special or advanced JavaScript features, such as ES6 classes, async/await, or modern syntax. The focus is on comparing the performance of basic string splitting methods.

**Other alternatives:**

If you were to compare these methods using other approaches, you might consider:

1. Using a string manipulation library like `lodash` or `string-parse`, which provide optimized implementations for common string operations.
2. Implementing custom string splitting functions using JavaScript's built-in regular expression engine (e.g., `new RegExp()`).
3. Using a just-in-time (JIT) compiler like SpiderMonkey (used by Mozilla Firefox) to optimize the performance of these methods.

Keep in mind that MeasureThat.net is primarily focused on comparing the performance of different JavaScript engines and optimizations, rather than exploring alternative implementation approaches.

Related benchmarks:

Array split vs string substring4 (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):