Benchmark: Replace all spaces with pluses

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

var loremIpsum = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.";
var loremPlus = "Lorem+ipsum+dolor+sit+amet,+consectetur+adipiscing+elit,+sed+do+eiusmod+tempor+incididunt+ut+labore+et+dolore+magna+aliqua.+Ut+enim+ad+minim+veniam,+quis+nostrud+exercitation+ullamco+laboris+nisi+ut+aliquip+ex+ea+commodo+consequat.+Duis+aute+irure+dolor+in+reprehenderit+in+voluptate+velit+esse+cillum+dolore+eu+fugiat+nulla+pariatur.+Excepteur+sint+occaecat+cupidatat+non+proident,+sunt+in+culpa+qui+officia+deserunt+mollit+anim+id+est+laborum.";

Tests:

String replaceAll
loremIpsum.replaceAll(" ", "+") == loremPlus
String replace with regex
loremIpsum.replace(/ /g, "+") == loremPlus
String split and join
loremIpsum.split(" ").join("+") == loremPlus

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
String replaceAll
String replace with regex
String split and join

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 10 days ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser/OS: Chrome 135 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
String replaceAll	882599.2 Ops/sec
String replace with regex	1030833.7 Ops/sec
String split and join	1518088.6 Ops/sec

Autogenerated LLM Summary (model gpt-4o-mini, generated 5 months ago):

LLMs can make mistakes. Check important info.

The benchmark provided is focused on evaluating the performance of different methods for replacing spaces in a long string (referred to as "loremIpsum") with plus signs ("+"). The benchmark compares three different approaches to achieve this goal, each with its own implications in terms of performance, readability, and maintainability.

### Benchmark Cases

1. **String replaceAll**:
   - **Code**: `loremIpsum.replaceAll(" ", "+")`
   - **Description**: This method is designed to replace all occurrences of a substring (in this case, a space) with another substring (plus sign). 
   - **Performance Result**: 1,699,284.375 executions per second.
   - **Pros**: 
     - Readable and straightforward.
     - Specifically implemented for replacing all instances in one call, making it semantically clear.
   - **Cons**: 
     - Limited support in older browsers (while it has broad support in modern browsers, check compatibility if targeting old environments).

2. **String replace with regex**:
   - **Code**: `loremIpsum.replace(/ /g, "+")`
   - **Description**: This method uses a regular expression to match all spaces (`/ /g` is a regex that looks for all instances of a space) and replaces them with plus signs. 
   - **Performance Result**: 614,472.5625 executions per second.
   - **Pros**: 
     - Flexible as it can be modified to support complex patterns if needed.
   - **Cons**: 
     - Slightly more difficult to read and understand compared to `replaceAll` for simpler replacements.
     - Regular expressions can be less performant due to the overhead of regex engine calculations.

3. **String split and join**:
   - **Code**: `loremIpsum.split(" ").join("+")`
   - **Description**: This method first splits the string into an array of substrings based on the space character and then joins them back together with a plus sign.
   - **Performance Result**: 1,063,568.25 executions per second.
   - **Pros**: 
     - This approach works in environments where `replaceAll` is not available.
     - It allows for custom manipulation of the array if needed before joining.
   - **Cons**: 
     - Introduces extra steps (creating an array and then reconstructing a string), making it less efficient than direct replacements.
     - More complex and less readable than `replaceAll`.

### Comparison and Considerations

When evaluating these methods, one should consider:

- **Performance**: In this particular benchmark, `replaceAll` was significantly faster than the other two methods, indicating it is the most efficient for this specific string manipulation task on the tested environments.
  
- **Readability**: `replaceAll` is also the most straightforward option, making the intent clear for anyone reading the code.

- **Compatibility**: Always check compatibility if the code needs to run in environments that may not support newer JavaScript features. If legacy support is a concern, the split/join method remains a viable alternative, though slightly slower.

- **Use Cases**: For simple replacements, prefer `replaceAll` for its performance and clarity. If there's a need to use complex patterns, go with the regex approach, but be aware of the performance cost.

### Other Alternatives

While the benchmark does not cover them, other string manipulation methods in JavaScript could include:

- **String.prototype.replace()**: Using the `replace` method with a custom loop for small strings or a specific count, though less efficient for multiple matches.
- **Third-Party Libraries**: Libraries such as Lodash offer utility functions that could enhance string manipulation but often come with a larger footprint for overhead.
  
Each of these alternatives has their domains of applicability, and when selecting one, considerations like performance, readability, maintainability, and compatibility should guide the decision.

Related benchmarks:

Replace all spaces with pluses (version: 1)

What's the fastest way to replace all spaces with pluses?

Comparing performance of: String replaceAll vs String replace with regex vs String split and join

Created: 5 months ago by: Registered User

Jump to the latest result

String replaceAll

String replace with regex

String split and join

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model gpt-4o-mini, generated 5 months ago):