Benchmark: parseInt() VS x.toFixed()

Tests:

Round floating number using parseInt()
for (var i = 0; i < 10000; i++) { parseInt(i) }
Round floating number using toFixed()
for (var i = 0; i < 10000; i++) { +i.toFixed() }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Round floating number using parseInt()
Round floating number using toFixed()

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 months ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser/OS: Chrome 133 on Linux

View result in a separate tab

Test name	Executions per second
Round floating number using parseInt()	131067.0 Ops/sec
Round floating number using toFixed()	689.9 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, compared, and considered.

**Benchmark Overview**

The main goal of this benchmark is to compare the performance of two JavaScript functions: `parseInt()` and `toFixed()`. Both functions are used for rounding floating-point numbers, but they have different approaches and potential trade-offs.

**Options Compared**

The benchmark tests two options:

1. **`parseInt()`**: This function takes a string argument and returns an integer value, rounding the input to the nearest integer.
2. **`toFixed()`**: This function rounds a number to a fixed number of decimal places, as specified by the `n` parameter (e.g., `Number.toFixed(2)` would round to two decimal places).

**Pros and Cons**

1. **`parseInt()`**:
	* Pros: Fast and simple, suitable for integer rounding.
	* Cons: Can be less accurate for floating-point numbers, as it may truncate or round incorrectly (e.g., `-0.99999` becomes `0`, not `-1`).
2. **`toFixed()`**:
	* Pros: More accurate for floating-point numbers, as it rounds to a fixed number of decimal places.
	* Cons: Generally slower than `parseInt()`, especially for large numbers or many decimal places.

**Library and Special JS Features**

There is no explicit library mentioned in the benchmark definition. However, the use of `toFixed()` implies that the JavaScript engine being tested supports this function.

No special JS features are explicitly used in the benchmark definitions. If any special features were used, they would likely be related to the specific libraries or frameworks being evaluated.

**Other Alternatives**

For rounding floating-point numbers, other alternatives could include:

1. **`Math.round()`**: This function rounds a number to the nearest integer, similar to `parseInt()`.
2. **`Number.EPSILON`**: This constant represents the smallest positive value that can be added to 1 and still have the same value as 1 in most environments.
3. **`BigDecimal` libraries**: These libraries provide arbitrary-precision arithmetic, allowing for precise rounding and manipulation of floating-point numbers.

**Benchmark Preparation Code**

The benchmark preparation code is not provided, but it's likely that the test case scripts are simple loops that execute the `parseInt()` or `toFixed()` function a large number of times (in this case, 10,000). The script preparation code might include setting up any necessary environment variables, loading libraries, or configuring the testing framework.

**Latest Benchmark Result**

The latest benchmark result shows the execution rate per second for each test case on various devices and browsers. The results likely indicate that `parseInt()` is faster than `toFixed()` in most cases, but with some variation depending on the device, browser, and system configuration.

Related benchmarks:

parseInt() VS x.toFixed() (version: 0)

Compare javascript native parseInt() function vs toFixed() function

Comparing performance of: Round floating number using parseInt() vs Round floating number using toFixed()

Created: 3 years ago by: Guest

Jump to the latest result

Round floating number using parseInt()

Round floating number using toFixed()

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):