Benchmark: Compare the ways to convert String to Number in JS +

Script Preparation code:

const minimum = 1
const maximum = 1000
var arr = Array.from({ length: 1000000 }, () => Math.floor(Math.random() * (maximum - minimum + 1)) + minimum)

Tests:

Number
return arr.map((el) => Number(el))
parseInt
return arr.map((el) => parseInt(el))
>>0
return arr.map((el) => el >> 0)
*1
return arr.map((el) => el * 1)
~~
return arr.map((el) => ~~el)
+
return arr.map((el) => +el)
|
return arr.map((el) => el|0)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Number
parseInt
>>0
*1
~~
+
\|

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 10 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:139.0) Gecko/20100101 Firefox/139.0

Browser/OS: Firefox 139 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
Number	83.1 Ops/sec
parseInt	125.7 Ops/sec
>>0	173.9 Ops/sec
*1	166.0 Ops/sec
~~	166.9 Ops/sec
+	174.0 Ops/sec
\|	127.2 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript benchmarking!

**Benchmark Definition**

The benchmark, "Compare the ways to convert String to Number in JS +", tests various methods for converting strings to numbers in JavaScript.

**Script Preparation Code**

The script preparation code generates an array `arr` with 1 million random integers between 1 and 1000. This array is used as input for the conversion tests.

**Html Preparation Code**

There is no HTML preparation code provided, which means that the benchmark only focuses on JavaScript performance.

**Individual Test Cases**

Each test case compares a different method for converting strings to numbers:

1. **Number**: Directly converts the string using `Number()`.
2. **parseInt**: Uses the `parseInt()` function to convert the string.
3. **>>0**: Shifts the bits of the number in the string, effectively removing leading zeros (only works with integers).
4. ***1**: Converts the string by multiplying it by 1 (no effect on floating-point numbers).
5. **~~**: Uses the bitwise NOT operator (~) to convert the string.
6. **+**: Uses the unary plus operator (+) to convert the string.

**Pros and Cons of Each Approach**

Here's a brief overview:

* **Number**: Direct conversion is often the fastest, but may throw errors if the input is not a valid number.
* **parseInt**: Can be faster for integers, but slower for floating-point numbers. It also assumes the radix (base) is 10.
* **>>0**: Works only with integers and can remove leading zeros, making it a good choice for formatting numbers. However, it's slower than direct conversion.
* ***1**: Converts any number (int or float) to an integer, but has no effect on floating-point numbers.
* **~~**: A more efficient alternative to `parseInt`, but can be less intuitive to use.
* **+**: Fast and efficient, but only works for integers. Not suitable for floating-point numbers.

**Library and Special Features**

In this benchmark, the following libraries are used:

* None explicitly mentioned, but the test cases assume standard JavaScript functionality.

No special JavaScript features are being tested in this benchmark.

**Other Alternatives**

For converting strings to numbers, other methods might include:

* ` parseFloat()` for floating-point conversion
* Using a library like `number-forces` or `js-number-format` for more complex formatting and validation
* Regular expressions (regex) for string manipulation

Keep in mind that the choice of method depends on the specific use case, performance requirements, and desired behavior.

**Benchmark Results**

The benchmark results show the executions per second for each test case. The top-performing methods are direct conversion (`Number`) and `parseInt`, while the slower methods are those involving bitwise operations or decimal conversions (`>>0`, `*1`, `~~`).

Related benchmarks:

Compare the ways to convert String to Number in JS + (version: 0)

Compare the most popular ways to convert string to number

Comparing performance of: Number vs parseInt vs >>0 vs *1 vs ~~ vs + vs |

Created: one year ago by: Guest

Jump to the latest result

Number

parseInt

>>0

*1

~~

+

|

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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