Benchmark: split str vs split re

Script Preparation code:

var str = ''
for (const i of [...Array(1000).keys()]) {
	str += i + '//\\'
}

Tests:

split str
var a = str.split('/')
split re
var b = str.split(/[\\\/]+/)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
split str
split re

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark is comparing two approaches to split a string: `split('/')` and `split(/[\\\\\\/]+/)`.

**Options Compared**

* `split('/')`: This method splits the input string into substrings using the `/` character as a delimiter.
* `split(/[\\\\\\/]+/)` : This method uses a regular expression to match one or more occurrences of the characters `\`, `/`, and backslashes (`\\`). The resulting matches are then returned as an array.

**Pros and Cons**

* **split('/')**:
	+ Pros: Simple, easy to understand, and widely supported.
	+ Cons: May not work correctly with strings containing multiple consecutive slashes (`//`).
* **split(/[\\\\\\/]+/)**:
	+ Pros: Handles strings with consecutive backslashes and other escape characters more robustly.
	+ Cons: Requires knowledge of regular expressions, which can be complex to understand and implement.

**Library Usage**

There is no specific library being used in this benchmark. The `split()` method is a built-in JavaScript function that works on most modern browsers.

**Special JS Feature or Syntax**

The benchmark uses the `[ ...Array(1000).keys() ]` syntax, which is a feature introduced in ECMAScript 2015 (ES6) for creating arrays with a specific number of elements. This allows us to generate an array of numbers from 0 to 999 without using loops.

**Other Considerations**

The benchmark likely aims to measure the performance difference between these two approaches on modern browsers. The use of a large input string (`str`) and multiple iterations (1000) is intended to simulate real-world usage scenarios and provide more accurate results.

**Alternatives**

Other alternatives for splitting strings in JavaScript include:

* Using the `String.prototype.split()` method with a custom separator.
* Utilizing third-party libraries like regex-escape or substring-skip.
* Leveraging built-in functions like `Array.prototype.map()` or `String.prototype.replace()`, although these may have different performance characteristics.

However, it's worth noting that using `split('/')` or `split(/[\\\\\\/]+/`) is often the most straightforward and efficient approach for simple string splitting tasks.

Related benchmarks:

split str vs split re (version: 0)

Comparing performance of: split str vs split re

Created: 2 years ago by: Registered User

Jump to the latest result

split str

split re

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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