Benchmark: Parse number removing insignificant digits

Tests:

Number (with string integer)
var numberStrInt = Number(Math.floor(1000 * Math.random()).toString());
Unary + (with string integer)
var unaryStrInt = +Math.floor(1000 * Math.random()).toString();
parseInt (with string integer)
var parseStrInt = parseInt(Math.floor(1000 * Math.random()).toString(), 10);
Double Bitwise (with string integer)
var numberStrFloat = ~~(1000 * Math.random()).toString();
Number (with integer)
var numberNumInt = Number(Math.floor(1000 * Math.random()));
Unary + (with integer)
var unaryNumInt = +Math.floor(1000 * Math.random());
parseInt (with integer)
var parseNumInt = parseInt(Math.floor(1000 * Math.random()), 10);
Double Bitwise
var numberNumFloat = ~~(1000 * Math.random());

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Number (with string integer)
Unary + (with string integer)
parseInt (with string integer)
Double Bitwise (with string integer)
Number (with integer)
Unary + (with integer)
parseInt (with integer)
Double Bitwise

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; rv:109.0) Gecko/20100101 Firefox/117.0

Browser/OS: Firefox 117 on Windows

View result in a separate tab

Test name	Executions per second
Number (with string integer)	41473100.0 Ops/sec
Unary + (with string integer)	41505120.0 Ops/sec
parseInt (with string integer)	1277845888.0 Ops/sec
Double Bitwise (with string integer)	4690700.0 Ops/sec
Number (with integer)	32574996.0 Ops/sec
Unary + (with integer)	711415104.0 Ops/sec
parseInt (with integer)	718727616.0 Ops/sec
Double Bitwise	843030656.0 Ops/sec

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The benchmark in question tests the performance of different methods for parsing numeric strings in JavaScript.

**Parsed Number/Integer Methods: What's Tested?**

The test cases compare various methods for parsing numeric strings, including:

1. **Number()**: Converts a string to a number using the `Number()` function.
2. **Unary +**: Converts a string to a number by using the unary plus operator (`+`) before converting it to an integer.
3. **parseInt()**: Parses a string as an integer using the `parseInt()` function with radix 10 (base 10).
4. **Double Bitwise**: Removes insignificant digits from a numeric string using bitwise operations.

**Comparison of Methods**

Each method has its pros and cons:

1. **Number()**:
	* Pros: Simple and efficient.
	* Cons: May be affected by precision issues due to the nature of floating-point representation in JavaScript.
2. **Unary +**:
	* Pros: Fast and simple, as it only requires a single operation.
	* Cons: Can lead to precision issues if the input string is not an integer.
3. **parseInt()**:
	* Pros: More accurate than `Number()` for parsing integers, as it allows specifying the radix.
	* Cons: May be slower than `Number()` due to its additional function call and radix parameter.
4. **Double Bitwise**:
	* Pros: Fast and efficient, with minimal reliance on JavaScript's built-in functions.
	* Cons: Can be more complex to implement, as it requires bitwise operations.

**Other Considerations**

When choosing a method for parsing numeric strings in JavaScript, consider factors such as:

* Performance: If speed is critical, `Unary +` or `Double Bitwise` may be the best choice. For more accurate results, use `parseInt()`.
* Precision: Be cautious when using methods like `Number()` or `Unary +`, which can lead to precision issues if not handled correctly.
* Readability and maintainability: Choose a method that is easy to understand and implement, as this will make your code easier to work with in the long run.

**Library Usage**

In this benchmark, no libraries are explicitly mentioned. However, it's worth noting that some browsers may use built-in libraries or functions for parsing numeric strings (e.g., `BigInt` or `Number()`).

**Special JavaScript Features/Syntax**

There is no mention of special JavaScript features or syntax in the provided information.

**Alternatives**

Other alternatives for parsing numeric strings in JavaScript include:

* **RegExp**: Regular expressions can be used to parse numeric strings, but this approach may be slower and more complex than using built-in functions.
* **BigInt**: Introduced in ECMAScript 2017, `BigInt` provides a way to work with integers in JavaScript, which might be useful for certain use cases.

Keep in mind that these alternatives may not offer significant performance or accuracy improvements over the methods tested in this benchmark.

Related benchmarks:

Parse number removing insignificant digits (version: 0)

Comparing performance of: Number (with string integer) vs Unary + (with string integer) vs parseInt (with string integer) vs Double Bitwise (with string integer) vs Number (with integer) vs Unary + (with integer) vs parseInt (with integer) vs Double Bitwise

Created: one year ago by: Guest

Jump to the latest result

Number (with string integer)

Unary + (with string integer)

parseInt (with string integer)

Double Bitwise (with string integer)

Number (with integer)

Unary + (with integer)

parseInt (with integer)

Double Bitwise

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):