Benchmark: toLocaleString vs custom thousands seperator4

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

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 gemma2:9b, generated one year ago):

LLMs can make mistakes. Check important info.

This benchmark compares two methods for formatting a large number with thousands separators:

**Method 1: `toLocaleString()`**

*   **Description:** This built-in JavaScript method formats a number according to the user's locale settings.  It automatically adds commas as thousands separators, and potentially other formatting based on the locale.
*   **Pros:** 
    *   Easy to use. 
    *   Locale aware, providing culturally appropriate formatting.

*   **Cons:** 
    *   Less control over the exact format. It relies on browser settings and may not be suitable for very specific formatting needs.
    *   Potentially slower than a custom implementation if you only need basic thousands separators.

**Method 2: Custom Function (`addThousandsSeperators()`)**

*   **Description:** This function manually iterates through the number string, adding commas as thousands separators based on fixed rules.

*   **Pros:**
    *   More control over the exact format.
    *   Potentially faster than `toLocaleString()` if you only need basic formatting.

*   **Cons:**
    *   Requires writing and maintaining custom code.
    *   Not locale-aware, so the output may not be culturally appropriate for all users.

**Considerations:**

*   **Performance:** The benchmark results show that the custom function is slightly faster in this specific case. However, the performance difference might not be significant in many real-world applications. 
*   **Maintainability:** The `toLocaleString()` approach is generally easier to maintain as it relies on built-in functionality.

**Alternatives:**

*   Other libraries:  There are various JavaScript libraries specializing in number formatting that offer more advanced features and customization options (e.g., numeral.js).

Let me know if you have any other questions!

Related benchmarks:

toLocaleString vs custom thousands seperator4 (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 gemma2:9b, generated one year ago):