Benchmark: Split join vs replace 2

Script Preparation code:

var example = 'AgreementChangeId'

Tests:

split + join
var result = example.split(/(?=[A-Z])/).join(' ');
replace
var result = example.replace(/([A-Z]+)/g, ' $1')
Different regex split + join
var result = example.split(/([A-Z])/).join(' ');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
split + join
replace
Different regex split + join

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model llama3.1:latest, generated one year ago):

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Let's dive into the world of JavaScript microbenchmarks.

**What is being tested?**

The benchmark tests three different approaches to achieve the same result: splitting and joining a string, replacing uppercase letters with spaces, and using a regular expression for splitting and joining.

**Test case 1: Split + Join**

* **Approach:** Using the `split()` method with a regex pattern `(?=[A-Z])` (positive lookahead) followed by the `join(' ')` method to insert spaces between each split.
* **Library/Feature:** None
* **Pros:**
	+ Efficient use of built-in string methods.
	+ Easy to read and understand code.
* **Cons:**
	+ Creates an array of strings, which might be a concern if memory efficiency is critical.

**Test case 2: Replace**

* **Approach:** Using the `replace()` method with a regex pattern `[A-Z]+` (one or more uppercase letters) followed by a replacement string `$1` to insert a space before each matched uppercase letter.
* **Library/Feature:** None
* **Pros:**
	+ Uses built-in string methods, making it efficient and easy to read.
* **Cons:**
	+ Requires multiple iterations of the `replace()` method for large strings.

**Test case 3: Different Regex Split + Join**

* **Approach:** Using the `split()` method with a regex pattern `([A-Z])` (capture group) followed by the `join(' ')` method to insert spaces between each split.
* **Library/Feature:** None
* **Pros:**
	+ Uses built-in string methods, making it efficient and easy to read.
	+ Avoids multiple iterations of the `replace()` method.
* **Cons:**
	+ Requires capturing groups in the regex pattern.

**Other considerations**

* **Performance differences:** The benchmark results show significant performance differences between the three approaches. Split + Join outperforms Replace, while Different Regex Split + Join performs similarly to Split + Join.
* **Browser support:** Since all test cases are executed on a Chrome browser, it's essential to consider how these methods behave on other browsers and platforms.

**Alternatives**

If you're looking for alternative approaches, consider the following:

* Using the `replace()` method with an array of replacement strings (e.g., `example.replace(/([A-Z]+)/g, ' $1')`)
* Using a library like String.js or lodash to perform string manipulations
* Exploring more efficient methods using WebAssembly or typed arrays for large-scale string processing

These alternatives might offer better performance or ease of use in specific scenarios. However, for most cases, the original approaches tested on MeasureThat.net should suffice.

Related benchmarks:

Split join vs replace 2 (version: 0)

Comparing performance of: split + join vs replace vs Different regex split + join

Created: 5 years ago by: Guest

Jump to the latest result

split + join

replace

Different regex split + join

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.1:latest, generated one year ago):