Benchmark: Math vs string concat

Script Preparation code:

var need =1;
var have = 2;

Tests:

Math
need * 1000 + have;
String
need + '-' + have;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Math
String

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (iPhone; CPU OS 14_4_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) FxiOS/33.1 Mobile/15E148 Safari/605.1.15

Browser/OS: Mobile Safari 14 on iOS 14.4.2

View result in a separate tab

Test name	Executions per second
Math	8460955.0 Ops/sec
String	6985040.5 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark is designed to compare the performance of two different approaches: using `Math` multiplication and string concatenation (`+`) to perform arithmetic operations. The test cases aim to measure which approach is faster in a given scenario.

**Options Compared**

The two options being compared are:

1. **Using Math multiplication**: This method uses the `*` operator to multiply two numbers.
2. **String concatenation with +**: This method uses the `+` operator to concatenate strings, and implicitly converts the numbers to strings for concatenation.

**Pros and Cons of Each Approach**

1. **Using Math multiplication**:
	* Pros: Generally faster and more efficient, especially for large numbers.
	* Cons: Requires exact numerical types (e.g., no floating-point or decimal operations) and can lead to precision issues if not handled correctly.
2. **String concatenation with +**:
	* Pros: Can handle decimal operations and provides a clear and explicit way of converting between numbers and strings.
	* Cons: Generally slower than `Math` multiplication, especially for large numbers, due to the overhead of string creation and manipulation.

**Library Used**

There is no specific library mentioned in the benchmark code. The test cases only use built-in JavaScript features.

**Special JS Feature or Syntax**

None are mentioned explicitly.

**Benchmark Preparation Code**

The script preparation code sets up two variables: `need` with a value of 1 and `have` with a value of 2.

**Individual Test Cases**

Each test case is defined by a benchmark definition in the format "expression" where:

* For the "Math" test case, the expression is `need * 1000 + have`.
* For the "String" test case, the expression is `need + '-' + have`.

These expressions are executed repeatedly to measure their performance.

**Latest Benchmark Result**

The result shows that on a specific mobile device (iPhone) running Mobile Safari 14, using `Math` multiplication outperforms string concatenation with `+`. The exact numbers indicate that the "Math" test case executes approximately 148K more times per second than the "String" test case.

**Other Alternatives**

There are other ways to perform arithmetic operations in JavaScript:

* Using `Number()` or `parseFloat()` to convert strings to numbers.
* Using template literals (`${expression}`) for concise string interpolation.
* Using libraries like `lodash` or `moment.js` that provide utility functions for arithmetic and date-related operations.

Keep in mind that the choice of approach depends on the specific requirements of your project, such as performance, readability, and maintainability.

Related benchmarks:

Math vs string concat (version: 0)

Comparing performance of: Math vs String

Created: 3 years ago by: Guest

Jump to the latest result

Math

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):