Benchmark: Number vs parseInt vs +string

Tests:

parseInt
let str = "123467891234"; parseInt(str);
Number
let str = "123467891234"; Number(str);
+string
let str = "123467891234"; +str;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
parseInt
Number
+string

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36

Browser/OS: Chrome 103 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
parseInt	8625116.0 Ops/sec
Number	14196991.0 Ops/sec
+string	998633920.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the explanation of the benchmark and its test cases.

**Benchmark Definition**

The provided JSON represents a JavaScript microbenchmark on MeasureThat.net, where users can create and run benchmarks to compare different approaches for performing certain operations. In this case, the benchmark compares three different methods: `parseInt`, `Number`, and the unary plus operator (`+string`).

**Test Cases**

There are three test cases in total:

1. **`parseInt`**: This test case uses the `parseInt` function to convert a string to an integer.
	* Library: None
	* Special JS feature/syntax: None
2. **`Number`**: This test case uses the `Number` function to convert a string to a number.
	* Library: JavaScript's built-in `Number` function is used, which is a part of the ECMAScript standard.
3. **`+string`**: This test case uses the unary plus operator (`+`) to convert a string to a number.
	* Library: None
	* Special JS feature/syntax: The unary plus operator (`+`) is a special syntax in JavaScript.

**Pros and Cons of each approach**

1. `parseInt`:
	* Pros:
		+ Fast, as it uses a native implementation.
		+ Can handle leading zeros.
	* Cons:
		+ May not work correctly for strings that don't represent integers (e.g., "123abc").
2. `Number`:
	* Pros:
		+ Works correctly for most string inputs (except those with non-numeric characters).
		+ Can be more readable than using the unary plus operator.
	* Cons:
		+ May be slower than `parseInt` due to the need for additional parsing steps.
3. `+string`:
	* Pros:
		+ Fast, as it uses a native implementation (just like `parseInt`).
	* Cons:
		+ May not work correctly if the string contains non-numeric characters.

**Other considerations**

When choosing between these approaches, consider the specific use case and requirements. If you need to handle strings that don't represent integers, `parseInt` might be a better choice. However, if you're working with mostly numeric strings, `Number` or `+string` might be more suitable.

**Alternatives**

If you need alternative methods for converting strings to numbers, consider the following:

1. Using a library like `moment.js` for date parsing and formatting.
2. Using a library like `decimal.js` for precise decimal arithmetic.
3. Implementing your own conversion function using regular expressions or string manipulation techniques.

Keep in mind that these alternatives may have different performance characteristics and requirements compared to the built-in `Number` function.

Related benchmarks:

Number vs parseInt vs +string (version: 0)

Comparing performance of: parseInt vs Number vs +string

Created: 2 years ago by: Guest

Jump to the latest result

parseInt

Number

+string

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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