Benchmark: String() vs .toString() vs +""

Tests:

String()
let num = 500; let nums = []; for(let i = 0; i < 100; ++i) { nums.push(String(num)); }
.toString()
let num = 500; let nums = []; for(let i = 0; i < 100; ++i) { nums.push(num.toString()); }
+""
let num = 500; let nums = []; for(let i = 0; i < 100; ++i) { nums.push(num+""); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
String()
.toString()
+""

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser/OS: Chrome 121 on Windows

View result in a separate tab

Test name	Executions per second
String()	80004.0 Ops/sec
.toString()	987196.9 Ops/sec
+""	2918783.2 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested, the options being compared, and their pros and cons.

**Benchmark Overview**

The benchmark is designed to compare the performance of three different ways to convert a number to a string in JavaScript: using the `String()` function, the `.toString()` method, and the concatenation operator (`+""`).

**Options Being Compared**

1. **String()**: This function takes a value as an argument and returns its string representation.
2. **.toString()**: This method is used to convert a value to a string. It's often used for object conversion (e.g., `obj.toString()`).
3. **+""**: This operator concatenates the value with an empty string, effectively converting it to a string.

**Pros and Cons of Each Approach**

1. **String()**:
	* Pros: Simple and straightforward.
	* Cons: May incur additional overhead due to function call, especially for large values.
2. **.toString()**:
	* Pros: Often used for object conversion, making it a common choice.
	* Cons: May not be as efficient as `String()` or the concatenation operator.
3. **+""**:
	* Pros: Can be faster than `String()` and `.toString()` due to operator overloading.
	* Cons: Less readable and more prone to errors, especially for complex values.

**Library Used**

None mentioned in this benchmark.

**Special JS Features or Syntax (not applicable)**

No special JavaScript features or syntax are being tested in this benchmark.

**Benchmark Results**

The latest benchmark results show that the `+""` approach outperforms the other two options. However, it's essential to note that these results may vary depending on the specific use case and implementation details.

**Alternative Approaches**

Other alternatives for converting a number to a string include:

1. Using the `Number()` function with the radix argument (e.g., `Number(num) + 0`).
2. Using template literals (e.g., `num.toString()`).
3. Using the `String.fromCharCode()` method (not applicable here, as it works with individual characters).

When writing JavaScript code, consider the trade-offs between performance, readability, and maintainability when choosing the best approach for converting a number to a string.

Related benchmarks:

String() vs .toString() vs +"" (version: 0)

Comparing performance of: String() vs .toString() vs +""

Created: 2 years ago by: Guest

Jump to the latest result

String()

.toString()

+""

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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