Benchmark: parseInt() vs Number()

Script Preparation code:

var tests = 1000
var toCast = "1"

Tests:

parseInt
while (i < tests) { parseInt(toCast) i++ }
Number
while (i < tests) { Number(toCast) i++ }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
parseInt
Number

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 123 on Android

View result in a separate tab

Test name	Executions per second
parseInt	15111712.0 Ops/sec
Number	15231431.0 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**
The benchmark is comparing the performance of two JavaScript functions: `parseInt()` and `Number()`. The function to be tested is applied to a string literal `"1"`, which represents an integer value. The goal of this benchmark is to determine which function is faster for this specific use case.

**Script Preparation Code**
The script preparation code is used to set up the testing environment before running each test case:
```javascript
var tests = 1000;
var toCast = "1";
```
This code sets two variables: `tests`, which represents the number of iterations (in this case, 1000), and `toCast`, which holds the string literal `"1"` that will be passed to the functions being tested.

**Html Preparation Code**
The html preparation code is not provided, but it's likely used by the benchmarking framework to set up the testing environment in a web browser. This code is skipped for this explanation.

**Test Cases**

### Test Case 1: `parseInt()`
```javascript
while (i < tests) {
    parseInt(toCast)
    i++
}
```
This test case applies the `parseInt()` function to the string literal `"1"`, which returns an integer value of 1. The loop iterates 1000 times, applying the function to the string on each iteration.

### Test Case 2: `Number()`
```javascript
while (i < tests) {
    Number(toCast)
    i++
}
```
This test case applies the `Number()` function to the string literal `"1"`, which also returns an integer value of 1. The loop iterates 1000 times, applying the function to the string on each iteration.

**Pros and Cons**

Both approaches have similar pros and cons:

* **Pros:**
	+ Both functions are widely supported in modern JavaScript engines.
	+ They provide a simple way to convert strings to numbers.
* **Cons:**
	+ `parseInt()` is more aggressive in parsing the input string, which can lead to performance issues with certain inputs. For example, if the input string contains leading zeros or other characters, `parseInt()` may return incorrect results.
	+ `Number()` is more relaxed in its parsing and returns NaN (Not a Number) for non-numeric strings.

**Library Usage**
In this benchmark, there are no external libraries used.

**Special JavaScript Features/Syntax**
There are no special JavaScript features or syntax used in these test cases. The code only uses basic JavaScript syntax and built-in functions.

**Alternative Benchmarks**

If you want to create a similar benchmark with different scenarios, consider the following alternatives:

1. Compare the performance of `Number()` with different input strings (e.g., `"1.2"`, `"hello world"`).
2. Add more test cases that use other numeric conversion methods, such as `parseFloat()`.
3. Introduce error handling and edge case testing to ensure the functions behave correctly in unexpected situations.
4. Explore performance differences between `parseInt()` and `Number()` for different data types (e.g., integers, floats, complex numbers).

Keep in mind that the benchmark's scope is limited to comparing the performance of two specific functions on a single input string. Expanding the test cases and scenarios can provide more insights into the behavior of these functions under various conditions.

Related benchmarks:

parseInt() vs Number() (version: 0)

Comparing performance of: parseInt vs Number

Created: 2 years ago by: Guest

Jump to the latest result

parseInt

Number

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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