Benchmark: Number to string, extract decimals 2021-08-05

Tests:

Number plus string
(2.44 + '').split('.')[1]
String constructor
String(2.44).split('.')[1]
ToString function
(2.44).toString().split('.')[1]
Template Literal
`${2.44}`.split('.')[1]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Number plus string
String constructor
ToString function
Template Literal

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36 Edg/92.0.902.62

Browser/OS: Chrome 92 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Number plus string	4924487.5 Ops/sec
String constructor	2809260.2 Ops/sec
ToString function	4563645.5 Ops/sec
Template Literal	5187863.5 Ops/sec

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The provided benchmark tests the performance of different ways to extract decimals from numbers in JavaScript. The test cases use various methods, including string concatenation, template literals, and function calls.

**Test Cases**

There are four test cases:

1. **Number plus string**: `(2.44 + '')` - This method converts the number to a string by concatenating it with an empty string.
	* Pros: Simple and easy to implement.
	* Cons: Can lead to unexpected results if not used carefully, as the `+` operator has different precedence rules for numbers and strings.
2. **String constructor**: `String(2.44)` - This method converts the number to a string using the `String()` function.
	* Pros: Explicitly creates a new string object, which can be useful in certain situations.
	* Cons: May incur additional overhead due to the creation of a new string object.
3. **ToString function**: `(2.44).toString()` - This method converts the number to a string using the `toString()` function on an object that represents the number (e.g., a DOM element or a string).
	* Pros: Efficient, as it leverages the optimized implementation of the `toString()` function.
	* Cons: Requires the creation of an intermediate object representation, which may incur additional overhead.
4. **Template Literal**: ``${2.44}` .split('.')[1]` - This method uses template literals to convert the number to a string and then extracts the decimal part using the `split()` method.
	* Pros: Explicitly creates a new string, which can help with debugging and readability.
	* Cons: May incur additional overhead due to the creation of a new string object.

**Library Usage**

None of the test cases explicitly use any libraries or frameworks beyond the standard JavaScript library. However, it's worth noting that some browsers may have experimental features or extensions that could potentially affect the results of these tests.

**Special JS Features/Syntax**

The template literal syntax ``${2.44}` .split('.')[1]` uses a feature introduced in ECMAScript 2015 (ES6). This feature allows for embedding expressions within strings using backticks (`) instead of double quotes (`"`) or single quotes (''). The `.split()` method is then used to extract the decimal part from the resulting string.

**Alternative Approaches**

Some alternative approaches to extracting decimals from numbers could include:

* Using a regular expression: `Number(2.44).match(\.[1-9]+\d*)[1]`
* Converting the number to a string using a format specifier (e.g., `2.44.toFixed(2)`)
* Using a third-party library like moment.js or Intl.NumberFormat

These alternative approaches may have different performance characteristics and trade-offs, depending on the specific use case and requirements.

**Other Considerations**

When benchmarking JavaScript performance, it's essential to consider factors such as:

* Garbage collection cycles
* Variable scope and accessibility
* Function call overhead
* String concatenation or interpolation methods

These factors can significantly impact the performance of JavaScript code, especially in scenarios with high execution rates or complex logic.

Keep in mind that the benchmark results may vary depending on the specific browser, version, and hardware used. It's always a good idea to run multiple benchmarks with different environments to get a more comprehensive understanding of the performance characteristics of your code.

Related benchmarks:

Number to string, extract decimals 2021-08-05 (version: 0)

Comparing performance of: Number plus string vs String constructor vs ToString function vs Template Literal

Created: 3 years ago by: Guest

Jump to the latest result

Number plus string

String constructor

ToString function

Template Literal

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):