Benchmark: lodash capitalize vs regex replace

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.4/lodash.min.js"></script>

Tests:

Regex replace
function capitalize(str) { return str.replace(/(^[a-z]|\s[a-z])/g, text => text.toUpperCase()) } for ( let i = 0; i < 100000; i++) { capitalize('ho hiep 111') }
lodash
for ( let i = 0; i < 100000; i++) { _.capitalize('ho hiep 111') }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Regex replace
lodash

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/132.0.0.0 Safari/537.36

Browser/OS: Chrome 132 on Windows

View result in a separate tab

Test name	Executions per second
Regex replace	24.5 Ops/sec
lodash	174.4 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 provided benchmark and explain what's being tested.

**Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The benchmark in question compares two approaches for capitalizing a string: using Lodash's `capitalize` function versus a regular expression-based approach.

**Options compared**

The two options being compared are:

1. **Lodash's `capitalize` function**: This is a utility function provided by the popular JavaScript library Lodash. It takes a string as input and returns the first character of the string in uppercase, followed by the rest of the characters in lowercase.
2. **Regular expression-based approach**: This approach uses a regular expression to match the first character of the string (or the first whitespace character) and converts it to uppercase, while leaving the rest of the characters unchanged.

**Pros and cons**

1. **Lodash's `capitalize` function**:
	* Pros:
		+ Faster execution times due to the optimized implementation.
		+ More concise and readable code.
		+ Less prone to errors, as Lodash is a well-maintained library.
	* Cons:
		+ Requires an additional JavaScript file (Lodash) to be included in the benchmark.
		+ May not be suitable for very large strings or performance-critical applications.
2. **Regular expression-based approach**:
	* Pros:
		+ Can be more flexible and adaptable to different use cases.
		+ Does not require an additional JavaScript file.
	* Cons:
		+ Slower execution times due to the overhead of regular expressions.
		+ More prone to errors, especially when dealing with complex string patterns.

**Library: Lodash**

Lodash is a popular JavaScript library that provides a wide range of utility functions for tasks such as array manipulation, string manipulation, and more. The `capitalize` function is just one example of the many useful functions available in Lodash.

**Special JS feature or syntax: None**

There are no special JavaScript features or syntaxes used in this benchmark.

**Other alternatives**

If you want to explore other options for capitalizing a string, you could consider using:

1. **String.prototype.toUpperCase()**: This method is built-in to most modern JavaScript engines and can be used to capitalize the first character of a string.
2. **Intl.DateTimeFormat**: This API provides a way to format dates and strings according to locale-specific rules, which may include capitalizing the first character.

However, these alternatives are not being compared in this specific benchmark, as they do not fit into the scope of the comparison between Lodash's `capitalize` function and the regular expression-based approach.

Related benchmarks:

lodash capitalize vs regex replace (version: 0)

Comparing performance of: Regex replace vs lodash

Created: 7 years ago by: Guest

Jump to the latest result

Regex replace

lodash

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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