Benchmark: .split(" ") vs .split(/\s+/)

Script Preparation code:

var str = 'Abcd efghij klmnopqrstuv wxy Abcd efghij klmnopqrstuv wxy Abcd efghij klmnopqrstuv wxyAbcd efghij   klmnopqrstuv wxy Abcd  efghij klmnopqrstuv    wxy Abcd efghij klmnopqrstuv wxy';

Tests:

Str.split
str.split(" ")
str.split regex
str.split(/\s+/)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Str.split
str.split regex

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

Let's break down what's being tested on MeasureThat.net.

The benchmark is comparing two approaches to splitting a string in JavaScript:

1. `str.split(" ")`: This uses the space character as the separator. It splits the string into an array of substrings using spaces as delimiters.
2. `str.split(/\s+/)`: This uses a regular expression (`/`) to match one or more whitespace characters (`\s+`). It also splits the string into an array of substrings using whitespace characters as delimiters.

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

**`str.split(" ")`**

Pros:

* Simple and easy to understand
* Fast, since it uses a simple string comparison

Cons:

* May not work correctly with Unicode whitespace characters (e.g., tabs, line breaks)
* Can be slow for large strings due to the use of string concatenation to create the regex pattern

**`str.split(/\s+/)`**

Pros:

* Works correctly with Unicode whitespace characters
* Can be faster than `str.split(" ")` since it uses a single regex operation instead of multiple string comparisons

Cons:

* May be slower for very small strings due to the overhead of creating and executing the regex pattern
* Can be less readable for some developers, especially those unfamiliar with regular expressions

Another consideration is that both approaches can be optimized by using `String.prototype.split()` with a separator argument, which can improve performance.

Now, let's talk about libraries used in this benchmark:

There doesn't appear to be any external library used in this benchmark. The two approaches being compared are built-in JavaScript methods.

Finally, there's no special JS feature or syntax being tested here. Both approaches use standard JavaScript methods and don't rely on any experimental or proposed features.

If you're interested in exploring other alternatives for string splitting, some popular libraries include:

* Lodash (`_`: `_.split()`)
* Underscore.js (`_`: `_._.split()`)
* Ramda (`R`: `R.split()`)

Keep in mind that these libraries may introduce additional dependencies or complexity to your project.

The latest benchmark result shows the performance differences between the two approaches on a Chrome 106 browser running on Windows desktop, with 6835,437 and 1,202,034 executions per second for `str.split(" ")` and `str.split(/\s+/)` respectively.

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/106.0.0.0 Safari/537.36

Browser/OS: Chrome 106 on Windows

View result in a separate tab

Test name	Executions per second
Str.split	6835437.0 Ops/sec
str.split regex	1202034.0 Ops/sec

Related benchmarks:

.split(" ") vs .split(/\s+/) (version: 0)

Comparing performance of: Str.split vs str.split regex

Created: 2 years ago by: Guest

Jump to the latest result

Str.split

str.split regex

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):