Benchmark: Number vs + vs parseInt

Tests:

Number
var number = Number(Math.random().toString());
Unary +
var unary = +Math.random().toString();
parseInt
var parse = parseInt(Math.random().toString(), 10);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Number
Unary +
parseInt

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one month ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:136.0) Gecko/20100101 Firefox/136.0

Browser/OS: Firefox 136 on Windows

View result in a separate tab

Test name	Executions per second
Number	8380920.5 Ops/sec
Unary +	8502796.0 Ops/sec
parseInt	260149728.0 Ops/sec

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

LLMs can make mistakes. Check important info.

I'd be happy to help you understand what's being tested in the provided benchmark.

**Benchmark Overview**

The benchmark is designed to measure the performance difference between three ways of converting a random string to a number: using the built-in `Number` function, the unary plus operator (`+`), and the `parseInt` function.

**Options Compared**

There are three test cases:

1. **Number**: This test case uses the `Number` function to convert a random string to a number.
2. **Unary +**: This test case uses the unary plus operator (`+`) to convert a random string to a number.
3. **parseInt**: This test case uses the `parseInt` function to convert a random string to an integer, with the radix (base) set to 10.

**Pros and Cons of Each Approach**

1. **Number**: This approach is simple and efficient, as it only requires a single function call. However, it may not work correctly for certain types of input strings.
2. **Unary +**: This approach is also simple and efficient, but it can be slower than the `Number` function due to the overhead of evaluating the operator. Additionally, this approach assumes that the input string can always be converted to a number using the unary plus operator, which may not always be the case.
3. **parseInt**: This approach provides more control over the conversion process, as it allows specifying the radix (base) for conversion from a string to an integer. However, it requires more function calls than the `Number` and unary + approaches.

**Library Usage**

None of the test cases use any external libraries.

**Special JavaScript Features or Syntax**

There are no special JavaScript features or syntax used in these test cases. The focus is on comparing the performance of different ways to convert a string to a number.

**Other Alternatives**

If you want to measure the performance of other ways to convert a string to a number, such as using `parseFloat` instead of `Number`, or experimenting with different radix values for `parseInt`, you can modify the benchmark definition and test cases accordingly.

For example, you could add another test case like this:

```
{
    "Benchmark Definition": "var float = parseFloat(Math.random().toString());",
    "Test Name": "parseFloat"
}
```

This would allow you to compare the performance of different ways to convert a string to a number, including `Number`, unary +, `parseInt`, and `parseFloat`.

Related benchmarks:

Number vs + vs parseInt (version: 0)

Comparing performance of: Number vs Unary + vs parseInt

Created: 4 years ago by: Guest

Jump to the latest result

Number

Unary +

parseInt

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):