Benchmark: Number() vs Number.parseInt() vs parseInt()

Script Preparation code:

function test1() {
 return Number('1'); 
}

function test2() {
 return Number.parseInt('1', 10); 
}

function test3() {
 return parseInt('1', 10) 
}

Tests:

Number
test1();
Number.parseInt
test2();
parseInt
test3();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Number
Number.parseInt
parseInt

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 7 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36

Browser/OS: Chrome 142 on Windows

View result in a separate tab

Test name	Executions per second
Number	141589440.0 Ops/sec
Number.parseInt	135401904.0 Ops/sec
parseInt	127062384.0 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 JSON benchmark definition and explain what's being tested, compared, and analyzed.

**Benchmark Definition**

The benchmark is designed to compare the performance of three different approaches for converting a string to an integer in JavaScript:

1. `Number()`
2. `Number.parseInt()`
3. `parseInt()`

These functions are compared in their default implementations, without any additional configuration or options.

**Options Compared**

Here's a brief overview of each option and its pros/cons:

1. **`Number()`**: This function attempts to convert the string to an integer using a simple heuristic. If the conversion fails (e.g., due to non-numeric characters), it returns `NaN` (Not a Number).
	* Pros: Simple, widely supported.
	* Cons: May not work correctly for all inputs, can return unexpected results.
2. **`Number.parseInt()`**: This function is specifically designed for converting strings to integers. It takes an optional radix parameter (base) that specifies the number system to use.
	* Pros: More robust than `Number()`, handles more input cases.
	* Cons: Requires a radix parameter, which can be overlooked or misconfigured.
3. **`parseInt()`**: This function is similar to `Number.parseInt()`, but without the radix parameter. It defaults to base 10 (decimal) if no radix is specified.
	* Pros: Simple and widely supported, with default behavior that's easy to use.
	* Cons: May not work correctly for all inputs or radix values.

**Library**

In this benchmark, `Number.parseInt()` and `parseInt()` are two separate functions, not a single library. However, the former is part of the ECMAScript standard, while the latter is a common alias for `Number.parseInt()` in some JavaScript implementations (e.g., older versions of Internet Explorer).

**Special JS Feature/Syntax**

This benchmark does not use any special JavaScript features or syntax beyond the basic functions being compared.

**Other Considerations**

When comparing these functions, consider the following factors:

* Input validation: How robust are these functions against malformed input?
* Performance: Which function is faster for converting strings to integers?
* Flexibility: Can each function handle different radix values or input formats?

**Alternatives**

If you're interested in exploring alternative approaches, here are a few options:

1. **`BigInt()`**: Introduced in ECMAScript 2017, this function provides support for arbitrary-precision integers. However, it's not specifically designed for converting strings to integers.
2. **Third-party libraries**: There are various JavaScript libraries (e.g., `decimal.js`, `numjs`) that provide more robust integer conversion functions with additional features and configuration options.

In summary, the provided benchmark tests three fundamental ways of converting strings to integers in JavaScript: `Number()`, `Number.parseInt()` (with and without radix), and `parseInt()`. The results help evaluate their performance, accuracy, and usability.

Related benchmarks:

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

VS

Comparing performance of: Number vs Number.parseInt vs parseInt

Created: 4 years ago by: Guest

Jump to the latest result

Number

Number.parseInt

parseInt

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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