Benchmark: Split join vs replace (fixed string)

Script Preparation code:

var example = 'Agreement#Change#Id'

Tests:

split + join
var result = example.split('#').join(' ');
replace
var result = example.replace('#', ' ')

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) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36

Browser/OS: Chrome 112 on Windows

View result in a separate tab

Test name	Executions per second
split + join	3867041.2 Ops/sec
replace	9009978.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases.

**Benchmark Definition:**
The benchmark is testing two different approaches to replace a fixed string in a string variable `example`. The string `example` is set to `"Agreement#Change#Id"` before running each test case. There are no special JavaScript features or syntax used here, so we'll focus on the methods themselves.

**Options being compared:**

1. **Split + Join**: This approach involves splitting the input string `example` into an array using the `#` delimiter and then joining it back together with a space in between.
2. **Replace**: This approach uses a regular expression to replace all occurrences of `#` with a space.

**Pros and Cons:**

* **Split + Join:**
	+ Pros:
		- Can be efficient for small strings or when the delimiter is not commonly found in other parts of the string.
		- Allows for flexibility in handling multiple delimiters (although this might impact performance).
	+ Cons:
		- May involve more overhead due to array creation and manipulation.
		- Can be slower than replace for large input strings or common delimiters.
* **Replace:**
	+ Pros:
		- Typically faster and more efficient, especially for large input strings or when the delimiter is common.
		- Uses a regular expression engine under the hood, which can provide better performance.
	+ Cons:
		- May not be as flexible as split + join if you need to handle multiple delimiters.
		- Can be slower than split + join for very small input strings.

**Library usage:**
The benchmark definition does not explicitly mention any libraries being used. However, the `replace` method in JavaScript typically uses a regular expression engine under the hood, which may utilize some underlying library or framework functionality.

**Other considerations:**

* The benchmark is running on Chrome 112 on a desktop Windows platform, with an execution rate of approximately 9 million operations per second.
* The raw UA string (User Agent) provided suggests that the test is being run in a headless browser environment, possibly using a tool like Selenium or Puppeteer.

**Alternatives:**
Other alternatives for replacing a fixed string in JavaScript could include:

1. Using a more efficient regular expression engine, such as `String.prototype.replaceAll()`.
2. Utilizing a dedicated string replacement library, like StringPilot or replacer.
3. Implementing a custom, optimized string replacement function using bitwise operations or other low-level techniques.

Keep in mind that the choice of approach will depend on the specific requirements and constraints of your project.

Related benchmarks:

Split join vs replace (fixed string) (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>

Experimental features:

Fastest: N/A

Slowest: N/A

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