Benchmark: splitAndJoin vs replaceAll in Javascript

Script Preparation code:

var example = 'G()(al)'

Tests:

split + join
var result = example.split("()").join("o").split("(al)").join("al");
replace
var result = example.replaceAll("()", "o").replaceAll("(al)", "al")

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
split + join
replace

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:125.0) Gecko/20100101 Firefox/125.0

Browser/OS: Firefox 125 on Windows

View result in a separate tab

Test name	Executions per second
split + join	1796216.0 Ops/sec
replace	3717254.8 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**

The benchmark is comparing two different approaches to manipulate a string: `splitAndJoin` vs `replaceAll`. The input string is defined in the "Script Preparation Code": `"var example = 'G()(al)'"`, which contains nested parentheses.

**Options Compared**

Two options are compared:

1. **`splitAndJoin`**: This approach splits the string into parts using the `(` character as a delimiter, joins them back together using the `o` character, and then splits again to remove the outermost parentheses.
2. **`replaceAll`**: This approach uses two consecutive `replaceAll` methods to replace all occurrences of `( )` with `o`, followed by replacing all occurrences of `(al)` with `al`.

**Pros and Cons**

* **`splitAndJoin`**:
	+ Pros: Simple, straightforward approach that leverages built-in string splitting and joining methods.
	+ Cons: May be slower due to the overhead of creating an array from the split result and then joining it back together. Also, this approach doesn't handle nested parentheses correctly, as demonstrated by the original input string.
* **`replaceAll`**:
	+ Pros: Efficient replacement approach that avoids the need for intermediate data structures like arrays. It's also more straightforward to understand than `splitAndJoin`.
	+ Cons: Requires two separate replacements, which might be slower or less efficient in some cases.

**Library and Syntax Considerations**

No libraries are explicitly mentioned in this benchmark. However, it's worth noting that the use of parentheses in the input string is a feature-specific aspect of JavaScript (specifically, ES6 syntax) that may not be supported by all browsers or environments.

**Other Alternatives**

If you're interested in exploring alternative approaches, here are some options:

1. **`replace()` with a regular expression**: You could use a single `replace()` method with a regular expression to achieve the same result as `replaceAll()`.
2. **`substring()` and concatenation**: Another approach would be to use `substring()` to extract specific parts of the string, concatenate them, and then repeat this process until all substrings are removed.
3. **Custom parsing and manipulation**: Depending on your goals and requirements, you might consider implementing a custom parser to break down the input string into smaller components, manipulate each part separately, and then reassemble the result.

Keep in mind that these alternatives may have different performance characteristics, and it's essential to test them thoroughly before deciding which approach is best for your specific use case.

Related benchmarks:

splitAndJoin vs replaceAll in Javascript (version: 0)

Comparing performance of: split + join vs replace

Created: one year ago by: Guest

Jump to the latest result

split + join

replace

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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