Benchmark: test simple parse string to number

Script Preparation code:

var a = "42";

Tests:

parseInt
const b = parseInt(a);
Number
const c = Number(a);

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: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser/OS: Chrome 130 on Windows

View result in a separate tab

Test name	Executions per second
parseInt	4754629.5 Ops/sec
Number	4821781.5 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 JSON and explain what is being tested in this JavaScript microbenchmark.

**Benchmark Overview**

The benchmark measures the performance difference between using `parseInt()` and `Number()` functions to parse a string to an integer. The input string is set to `"42"`.

**Options Compared**

Two options are being compared:

1. **`parseInt()`**: This function takes two arguments: the string to be parsed, and an optional radix (base) for the parsing. Since no radix is specified in this benchmark, it defaults to base 10.
2. **`Number()`**: This built-in JavaScript function attempts to convert a string to a number using various methods, including coercion to a decimal value.

**Pros and Cons**

* **`parseInt()`**:
	+ Pros: Fast, efficient, and well-supported in most browsers.
	+ Cons: May not work correctly for strings that cannot be converted to integers (e.g., NaN, infinity). Requires two arguments, which can lead to code duplication.
* **`Number()`**:
	+ Pros: More flexible, as it attempts to convert the string to a number using various methods. However, this may come at the cost of performance due to the additional complexity.
	+ Cons: May be slower than `parseInt()` for strings that can be converted to integers.

**Library and Purpose**

None are explicitly mentioned in the provided JSON.

**Special JS Features or Syntax**

Neither `parseInt()` nor `Number()` utilize any special JavaScript features or syntax. They are both standard built-in functions that have been part of the language since its inception.

**Other Alternatives**

If you need to parse strings to integers, other alternatives might include:

1. **`toString()` and `parseFloat()`**: This combination would involve calling `toString()` on the number before passing it to `parseFloat()`, which can provide more control over the parsing process.
2. **Using a regular expression**: You could use a regular expression to extract the integer part from the string, followed by converting it to an integer using `parseInt()`.
3. **Using a library**: Depending on your specific requirements, you might consider using a library like Moment.js for date parsing or a numerical parsing library like mathjs.

In summary, the benchmark is designed to compare the performance of two common methods for parsing strings to integers in JavaScript: `parseInt()` and `Number()`. The choice between these options depends on your specific use case and requirements.

Related benchmarks:

test simple parse string to 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):