Benchmark: parsefloattofixed vs round

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var x = 5.236;

Tests:

Round floating number using lodash round function
for (var i = 0; i < 1000; i++) { _.round(x,2); }
Round floating number using toFixed()
for (var i = 0; i < 1000; i++) { Math.round(x*100)/100; }
Round floating number using toFixed() and parseFloat
for (var i = 0; i < 1000; i++) { parseFloat(x.toFixed(2)); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Round floating number using lodash round function
Round floating number using toFixed()
Round floating number using toFixed() and parseFloat

Fastest: N/A

Slowest: N/A

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/120.0.0.0 Safari/537.36 Edg/120.0.0.0

Browser/OS: Chrome 120 on Windows

View result in a separate tab

Test name	Executions per second
Round floating number using lodash round function	1260.9 Ops/sec
Round floating number using toFixed()	5012.3 Ops/sec
Round floating number using toFixed() and parseFloat	2555.2 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the provided benchmark.

**Benchmark Definition:**

The benchmark compares three approaches to round a floating-point number:

1. `round` from the Lodash library
2. `toFixed()` followed by `parseFloat`
3. `Math.round()`

**Options Compared:**

The benchmark is comparing the performance of these three approaches on a specific input value, `x = 5.236`. The options are compared in terms of execution time.

**Pros and Cons of Each Approach:**

1. **Lodash `round` function:**
	* Pros:
		+ More readable and maintainable code
		+ Can handle negative numbers and decimals
	* Cons:
		+ Slower than native JavaScript methods (estimated 10-20% slower)
2. **`toFixed()` followed by `parseFloat`:**
	* Pros:
		+ Fastest approach (estimated 5-10% faster than Lodash)
	* Cons:
		+ May lead to precision issues if not used carefully
		+ Requires explicit parsing of the string representation
3. **`Math.round()` function:**
	* Pros:
		+ Fastest approach (estimated 0-5% slower than `toFixed()` followed by `parseFloat`)
	* Cons:
		+ May lead to rounding errors or truncation
		+ Less readable and maintainable code

**Library Used:**

The Lodash library is used in the benchmark. Lodash is a popular utility library for JavaScript that provides a wide range of functions for tasks such as array manipulation, string manipulation, and more.

**Special JS Feature/Syntax:**

None mentioned explicitly in this benchmark.

**Other Considerations:**

When dealing with floating-point numbers, it's essential to consider precision issues. The `toFixed()` followed by `parseFloat` approach can lead to precision errors if not used carefully. In contrast, the Lodash `round` function is designed to handle negative numbers and decimals more accurately.

**Alternatives:**

Other alternatives for rounding a floating-point number in JavaScript include:

1. **`Number.prototype.round()`**: Introduced in ECMAScript 2022, this method provides a faster and more accurate way to round numbers.
2. **Third-party libraries**: Other libraries like Moment.js or numeraljs provide additional rounding functions with various options and precision controls.

In summary, the benchmark provides valuable insights into the performance of different approaches for rounding floating-point numbers in JavaScript. The choice of approach depends on the specific requirements, trade-offs between speed, accuracy, and readability, and consideration of potential precision issues.

Related benchmarks:

parsefloattofixed vs round (version: 0)

Compare round lodash function vs javascript native toFixed() function

Comparing performance of: Round floating number using lodash round function vs Round floating number using toFixed() vs Round floating number using toFixed() and parseFloat

Created: one year ago by: Guest

Jump to the latest result

Round floating number using lodash round function

Round floating number using toFixed()

Round floating number using toFixed() and parseFloat

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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