Benchmark: Intl.DateTimeFormat vs Reduce/Replace Format

Script Preparation code:

var date = new Date(2021, 2, 24)

var formatDateByIntlDateTimeFormat = (date) => {
  return new Intl.DateTimeFormat('pt-BR').format(date)
}

var tokens = {
  // Padded day       = 01, 02, ..., 31
  DD: (date) => date.getDate().toString().padStart(2, '0'),
  // Padded month     = 01, 02, ..., 12
  MM: (date) => (date.getMonth() + 1).toString().padStart(2, '0'),
  // Padded year      = 0001, 0002, ..., 1995, ..., 2020, 2021
  YYYY: (date) => date.getFullYear().toString().padStart(4, '0'),
};

var formatDateByReduceReplace = (date, format = 'DD/MM/YYYY') => {
  return Object.entries(tokens).reduce(
    (result, [pattern, fn]) => result.replace(new RegExp(pattern, 'g'), fn(date)),
    format
  );
};

Tests:

Intl.DateTimeFormat
formatDateByIntlDateTimeFormat(date)
Reduce/Replace Format
formatDateByReduceReplace(date, 'DD/MM/YYYY')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Intl.DateTimeFormat
Reduce/Replace Format

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down the provided JSON and benchmark.

**Benchmark Definition**

The provided JSON defines two benchmark tests:

1. `Intl.DateTimeFormat vs Reduce/Replace Format`: This test compares the performance of two approaches for formatting dates:
	* `formatDateByIntlDateTimeFormat`: Uses the `Intl.DateTimeFormat` API to format a date.
	* `formatDateByReduceReplace`: Uses a custom reduce-and-replace approach to format a date.

**Options Compared**

The two options are compared in terms of execution speed (measured in executions per second). The test aims to determine which approach is faster.

**Pros and Cons**

1. **Intl.DateTimeFormat**:
	* Pros: Convenient, reliable, and well-supported by modern browsers.
	* Cons: May have performance overhead due to its API complexity and potential security risks if not used carefully.
2. **Reduce/Replace Format**:
	* Pros: Customizable, lightweight, and potentially faster since it doesn't rely on a browser-specific API.
	* Cons: Requires manual configuration of date patterns and may be more error-prone.

**Library and Purpose**

In the `formatDateByIntlDateTimeFormat` function, `Intl.DateTimeFormat` is used as a library to format dates. Its purpose is to provide a standardized way to format dates in a locale-independent manner.

**Special JS Feature/Syntax**

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

**Alternatives**

Other alternatives for formatting dates include:

1. Using built-in string methods like `toString()` and concatenation (e.g., `date.toString('DD/MM/YYYY')`).
2. Utilizing libraries like Moment.js or Luxon.
3. Implementing custom date formatting using regular expressions and template literals.

Keep in mind that these alternatives may have different performance characteristics and trade-offs compared to the `Intl.DateTimeFormat` API and the reduce-and-replace approach used in this benchmark.

Related benchmarks:

Intl.DateTimeFormat vs Reduce/Replace Format (version: 0)

Comparing performance of: Intl.DateTimeFormat vs Reduce/Replace Format

Created: 5 years ago by: Guest

Jump to the latest result

Intl.DateTimeFormat

Reduce/Replace Format

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):