Benchmark: split-join vs regex replace - small input

Script Preparation code:

var targetString = "Lorem ipsum dolor sit amet"
//Credits to lipsum.com for the text

Tests:

replace regex
targetString.replace(/ /g, "+");
split-join
targetString.split(" ").join("+");
replaceAll regex
targetString.replaceAll(/ /g, "+");
replaceAll string
targetString.replaceAll(" ", "+");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
replace regex
split-join
replaceAll regex
replaceAll string

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

**Benchmark Overview**

The provided benchmark compares four different approaches to replace or split strings:

1. `replace()` method with a regular expression (regex)
2. `split()` and `join()` methods
3. `replaceAll()` method with a regex
4. String concatenation (`+`)

**Options Compared**

The options being compared are the most common ways to manipulate strings in JavaScript. Here's a brief description of each:

* `replace()`: A built-in method that replaces substrings in a string using a provided function or regex.
* `split()` and `join()`: Methods used to split a string into an array of substrings and then join them back together, respectively.
* `replaceAll()`: A non-standard method (not supported by all browsers) that replaces all occurrences of a substring in a string. However, as per the benchmark code it's equivalent to the replace() method.

**Pros and Cons of Each Approach**

Here's a brief overview of the pros and cons of each approach:

* `replace()`:
	+ Pros: Fast, widely supported.
	+ Cons: Can be less readable than other approaches, may not handle complex regex patterns well.
* `split()` and `join()`:
	+ Pros: More explicit, easier to read, can handle more complex splitting and joining operations.
	+ Cons: May be slower for large inputs due to the overhead of creating an array.
* `replaceAll()`: (Not supported by all browsers)
	+ Pros: None
	+ Cons: Not supported by most browsers, may not work as expected in older or less capable browsers.

**Library and Special JS Features**

None of the options use a specific library, but they do demonstrate various aspects of JavaScript syntax:

* The `replace()` method uses regex to replace substrings.
* The `split()` and `join()` methods use array operations to manipulate strings.
* The `replaceAll()` method is not a standard browser method, but it's equivalent to the `replace()` method.

**Other Considerations**

When choosing an approach for string manipulation in JavaScript:

* For simple replacements, `replace()` with regex might be the fastest and most readable option.
* For more complex splitting or joining operations, `split()` and `join()` may be a better choice due to their explicit nature.
* When considering performance and compatibility, `replace()` might still be the best option.

**Alternatives**

If you're interested in exploring alternative approaches:

* Other regex methods, such as `match()` or `search()`, could be used for string manipulation.
* JavaScript's `String.prototype` has many other methods, like `trim()`, `slice()`, and `substr()`, that can be used for string manipulation.

Keep in mind that the choice of approach depends on your specific use case, personal preference, and performance requirements.

Related benchmarks:

split-join vs regex replace - small input (version: 0)

Comparing performance of: replace regex vs split-join vs replaceAll regex vs replaceAll string

Created: 4 years ago by: Guest

Jump to the latest result

replace regex

split-join

replaceAll regex

replaceAll string

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):