Benchmark: toLocaleString vs custom thousands seperator2

Script Preparation code:

var number = 1234567;

var addThousandsSeperators = (value) => {
  if (value.length <= 3) return value;
  return Array.from(value).reduce((acc, x, i, a) => (
    (a.length - i) % 3 === 0 && i ? `${acc},${x}` : `${acc}${x}`
  ), '');
};

Tests:

toLocaleString
number.toLocaleString();
custom thousands seperator
addThousandsSeperators(number.toString());

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
toLocaleString
custom thousands seperator

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 that represents the JavaScript microbenchmark:

**Benchmark Definition**

The benchmark is designed to compare two approaches for formatting numbers with thousands separators:

1. Using the `toLocaleString()` method
2. Creating a custom function to add thousands separators (`addThousandsSeperators`)

**What is tested?**

The benchmark tests which approach is faster and more efficient.

**Options compared**

The two options are:

* `toLocaleString()`: This is a built-in JavaScript method that formats numbers with a locale-specific format, including thousands separators.
* `custom thousands seperator` (using the `addThousandsSeperators` function): This custom function manually adds thousands separators to the number.

**Pros and Cons**

**Using `toLocaleString()`:**

Pros:

* Faster execution time (as it's a built-in method optimized for performance)
* Less code to write and maintain

Cons:

* May not produce consistent results across different locales
* Can be slower for very large numbers due to the formatting overhead

**Custom thousands separator (`addThousandsSeperators`):**

Pros:

* More control over the formatting output
* Can be more efficient for small to medium-sized numbers

Cons:

* Requires writing custom code, which can be error-prone and time-consuming to maintain
* May not be as fast as `toLocaleString()` due to the manual formatting process

**Library usage**

The `toLocaleString()` method uses the Intl API (Internationalization API), which is a built-in JavaScript library for handling locale-specific formatting. The Intl API provides a way to format numbers, dates, and other values according to the user's locale.

In this benchmark, the custom function `addThousandsSeperators` does not use any external libraries, but it relies on basic JavaScript array methods (e.g., `Array.from()`, `reduce()`).

**Special JS feature or syntax**

There is no special JS feature or syntax used in this benchmark. The code is standard JavaScript, using the features and APIs available in modern browsers.

**Other alternatives**

If you need to format numbers with thousands separators, other alternatives include:

* Using a library like Moment.js (which provides a more extensive set of formatting options)
* Creating a custom function using a different approach, such as using regular expressions or Unicode code points for the separator characters
* Using a template engine like Handlebars to generate the formatted string

Related benchmarks:

toLocaleString vs custom thousands seperator2 (version: 0)

Comparing performance of: toLocaleString vs custom thousands seperator

Created: 5 years ago by: Guest

Jump to the latest result

toLocaleString

custom thousands seperator

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):