Benchmark: X.Y string to ~~ vs parseInt vs Number vs parseFloat vs +0 vs /...

Script Preparation code:

var strA = "1912.62";
var strB = "1912.63";

Tests:

notnot
var res = ~~strA;
parseInt
var res = parseInt(strA);
Number
var res = Number(strA);
parseFloat
var res = parseFloat(strA);
*1
var res = strA * 1;
-0
var res = strA - 0;
+
var res = +strA;
<<0
var res = strA<<0;
/1
var res = strA / 1;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
notnot
parseInt
Number
parseFloat
*1
-0
+
<<0
/1

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/114.0.0.0 Safari/537.36

Browser/OS: Chrome 114 on Windows

View result in a separate tab

Test name	Executions per second
notnot	5298172.0 Ops/sec
parseInt	1914263.2 Ops/sec
Number	1713513.9 Ops/sec
parseFloat	1729914.5 Ops/sec
*1	2307597.2 Ops/sec
-0	707449.9 Ops/sec
+	1311244.4 Ops/sec
<<0	3135835.2 Ops/sec
/1	3295963.5 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases to understand what is being tested.

**Benchmark Definition**

The benchmark is designed to compare the performance of different ways to convert or manipulate a string value, specifically:

* `~~` (bitwise NOT)
* `parseInt`
* `Number`
* `parseFloat`
* Addition with implicit conversion (`strA * 1`)
* Subtraction with implicit conversion (`strA - 0`)
* Addition with explicit conversion (`+ strA`)
* Left shift operator (`<< 0`)
* Division with implicit conversion (`strA / 1`)

**Options Compared**

Each test case compares the performance of one specific option (e.g., `~~`, `parseInt`) against others. The options being compared are:

* Bitwise NOT (`~~`)
* Integer parsing (`parseInt`)
* Floating-point number parsing (`Number`)
* Floating-point number parsing with optional decimal part (`parseFloat`)
* Implicit conversion to integer or float using arithmetic operators
* Explicit conversion using the addition operator

**Pros and Cons of Each Approach**

Here's a brief analysis of each approach:

1. `~~` (bitwise NOT): This is an ancient and deprecated way to perform integer truncation in JavaScript. It's not recommended for use in modern code.
	* Pros: Fast, lightweight
	* Cons: Unreadable, non-standard syntax
2. `parseInt`: Parses a string as an integer value, optionally with a radix (base) parameter.
	* Pros: Flexible, widely supported
	* Cons: Can be slow for large strings, may not handle errors well
3. `Number` and `parseFloat`: Parse a string as a floating-point number value, optionally allowing decimal points.
	* Pros: More flexible than `parseInt`, can handle decimal numbers
	* Cons: May be slower than integer parsing, more complex syntax
4. Implicit conversion using arithmetic operators (`strA * 1` or `strA - 0`): Converts the string to a number value using multiplication or subtraction.
	* Pros: Simple, widely supported
	* Cons: May lose precision for large numbers, can be slow for very large strings
5. Explicit conversion using the addition operator (`+ strA`): Adds zero to the string, converting it to a number value.
	* Pros: Fast, lightweight
	* Cons: May not work as expected for negative numbers or decimal values

**Special JS Features/Syntax**

The benchmark tests some special JavaScript features and syntax:

1. Left shift operator (`<< 0`): Shifts the bits of the string value to the left by a fixed number (0) without changing its sign.
2. Explicit conversion using the addition operator (`+ strA`)

**Library Usage**

There is no explicit library usage in this benchmark.

**Other Alternatives**

Other alternatives for converting or manipulating strings in JavaScript include:

1. `atob` and `btoa`: Base64 encoding and decoding
2. `JSON.parse()` and `JSON.stringify()`: JSON data parsing and serialization
3. Regular expressions (`RegExp`)
4. String manipulation methods like `slice()`, `substring()`, `replace()`

Keep in mind that each alternative has its own strengths, weaknesses, and use cases. The choice of which one to use depends on the specific requirements of your project.

Related benchmarks:

X.Y string to ~~ vs parseInt vs Number vs parseFloat vs +0 vs /... (version: 0)

Comparing performance of: notnot vs parseInt vs Number vs parseFloat vs *1 vs -0 vs + vs <<0 vs /1

Created: one year ago by: Guest

Jump to the latest result

notnot

parseInt

Number

parseFloat

*1

-0

+

<<0

/1

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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