Benchmark: toFixed vs Math.round() - result as a number

Script Preparation code:

var someFloat = 0.123456789;

Tests:

toFixed(4)
Number(someFloat.toFixed(4));
(Math.round(*10000)/10000).toString()
(Math.round(someFloat*10000)/10000);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
toFixed(4)
(Math.round(*10000)/10000).toString()

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):

LLMs can make mistakes. Check important info.

Let's break down the benchmark definition and test cases.

**Benchmark Definition:**

The benchmark is testing the performance of two approaches to round a float number:

1. Using `toFixed()`: The script prepares a float variable `someFloat` and then calls `toFixed()` on it with a precision of 4, resulting in `Number(someFloat.toFixed(4))`.
2. Using a trick: The benchmark defines a temporary variable, multiplies the original float by 10,000, rounds it using `Math.round()`, and then divides by 10,000 to get back the original value. This is equivalent to `(Math.round(*10000)/10000).toString()`.

**Options Compared:**

The two approaches are compared:

* `toFixed(4)`: uses the built-in `toFixed()` method to round the float number.
* Trick approach: uses a custom trick to simulate rounding, without relying on the `toFixed()` method.

**Pros and Cons of each approach:**

1. **`toFixed(4)`**:
	* Pros:
		+ Easy to understand and use.
		+ No additional library dependencies required.
	* Cons:
		+ May have performance overhead due to calling a separate function.
		+ Rounding behavior might be influenced by the specified precision (in this case, 4 decimal places).
2. **Trick approach**:
	* Pros:
		+ Avoids potential performance overhead of `toFixed()` calls.
		+ Potentially more accurate rounding behavior (no dependency on precision).
	* Cons:
		+ Requires a custom trick to set up and execute.
		+ Might be less intuitive or easier to understand for some developers.

**Library/Features Used:**

None mentioned in the benchmark definition. No external libraries are required.

**Special JS Features/Syntax:**

The `toFixed()` method is used, which is a standard JavaScript method. However, there's no special feature or syntax used beyond that.

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/111.0.0.0 Safari/537.36 Edg/111.0.1661.51

Browser/OS: Chrome 111 on Windows

View result in a separate tab

Test name	Executions per second
toFixed(4)	2510647.8 Ops/sec
(Math.round(*10000)/10000).toString()	5217969.5 Ops/sec

Related benchmarks:

toFixed vs Math.round() - result as a number (version: 0)

Comparing performance of: toFixed(4) vs (Math.round(*10000)/10000).toString()

Created: 5 years ago by: Guest

Jump to the latest result

toFixed(4)

(Math.round(*10000)/10000).toString()

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 25 days ago):