Benchmark: To format date using new Date() vs Array.split()

Script Preparation code:

let months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
let dateArr = [];
let unformattedDate = "02/22/2022";
for (let i = 0; i < 10; i++) {
    let aDate = new Date(unformattedDate);
    dateArr.push(aDate.getDate() + " " + months[aDate.getMonth() - 1] + " " + aDate.getYear());
}
for (let i = 0; i < 10; i++) {
    let aDate = unformattedDate.split('/');
    dateArr.push(aDate[1] + " " + months[aDate[0]] + " " + aDate[2]);
}

Tests:

Date()
let months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']; let dateArr = []; let unformattedDate = "02/22/2022"; for (let i = 0; i < 10; i++) { let aDate = new Date(unformattedDate); dateArr.push(aDate.getDate() + " " + months[aDate.getMonth() - 1] + " " + aDate.getYear()); }
Split()
let months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']; let dateArr = []; let unformattedDate = "02/22/2022"; for (let i = 0; i < 10; i++) { let aDate = unformattedDate.split('/'); dateArr.push(aDate[1] + " " + months[aDate[0]] + " " + aDate[2]); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Date()
Split()

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The provided benchmark compares two approaches to format a date string in JavaScript: using the `new Date()` constructor and splitting the date string manually.

**Approaches Compared**

1. **`new Date()`**: This approach uses the `Date` object's constructor to parse the date string into a numerical representation, which can then be used to extract the individual components (year, month, day).
2. **Manual Splitting**: This approach splits the date string into its constituent parts using string manipulation techniques, such as slicing or splitting strings.

**Pros and Cons of Each Approach**

1. **`new Date()`**:
	* Pros:
		+ More concise and readable code
		+ Less prone to errors due to automatic parsing
	* Cons:
		+ May be slower due to the overhead of creating a `Date` object
		+ May not work correctly for all date formats or edge cases
2. **Manual Splitting**:
	* Pros:
		+ Can be more control over the output format
		+ May be faster for simple date parsing
	* Cons:
		+ More verbose and error-prone code
		+ May not work correctly for all date formats or edge cases

**Library: `Date`**

The `Date` object is a built-in JavaScript library that provides a way to represent dates and times in a standard format. Its constructor takes a string argument representing the date, which can be parsed into a numerical representation.

**Special JS Feature/Syntax: None**

This benchmark does not use any special JavaScript features or syntax beyond what is necessary for basic date parsing.

**Other Considerations**

* The benchmark assumes that the input date string is in the format `MM/DD/YYYY`.
* It uses a hardcoded array of months to avoid having to look up month names dynamically.
* The number of iterations (10) may not be sufficient to produce accurate results, especially if the functions being compared have different performance characteristics.

**Alternatives**

Other approaches for formatting dates in JavaScript include:

1. **Moment.js**: A popular library for working with dates and times in JavaScript.
2. **Date-fns**: Another lightweight library for parsing and manipulating dates in JavaScript.
3. **Manual date formatting using regex**: Using regular expressions to extract and format individual date components.

Each of these alternatives has its own trade-offs and use cases, and the choice of which one to use depends on the specific requirements of your project.

Related benchmarks:

To format date using new Date() vs Array.split() (version: 0)

Comparing performance of: Date() vs Split()

Created: 3 years ago by: Guest

Jump to the latest result

Date()

Split()

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):