Benchmark: Number to String: toString() vs String() 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: 3 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.36 Edg/144.0.0.0

Browser/OS: Chrome 144 on Windows

View result in a separate tab

Test name	Executions per second
String()	900830.2 Ops/sec
.toString()	1619012.9 Ops/sec
+ ""	6424557.0 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.

**Benchmark Definition**

The benchmark is called "Number to String: toString() vs String() vs + \"\""". It measures the performance of three different approaches for converting a number to a string:

1. `String()`
2. `.toString()`
3. `+ ""`

These approaches are equivalent in JavaScript, but they might have different performance characteristics due to various factors such as compiler optimizations, interpreter behavior, or browser-specific implementations.

**Options Compared**

The three options being compared are:

* `String()`: This is the most concise way to convert a number to a string. It's a built-in function that creates a new string object.
* `.toString()`: This approach uses the `toString()` method of the number object. It's equivalent to using `String()` but might be slightly slower due to method call overhead.
* `+ ""`: This is the old-school way of converting a number to a string by concatenating the number with an empty string (`""`). While it works, this approach can lead to performance issues when dealing with large numbers or strings.

**Pros and Cons**

Here's a brief summary of each option:

* `String()`:
	+ Pros: Concise and readable.
	+ Cons: Might be slower due to method call overhead (not significant in modern JavaScript engines).
* `.toString()`: 
	+ Pros: Similar performance to `String()` since it uses the same method, but might incur additional overhead due to method call.
	+ Cons: Slightly less readable than `String()`.
* `+ ""`:
	+ Pros: None (although some might argue that it's a simple and old-school approach).
	+ Cons: Can lead to performance issues when dealing with large numbers or strings.

**Library Usage**

There is no explicit library usage in the benchmark definition. However, if we look at the individual test cases, they use `let` declarations, which are part of the JavaScript language itself.

**Special JS Feature/Syntax**

There doesn't seem to be any special JavaScript feature or syntax being tested here. The code snippets used in the benchmark definition and test cases are straightforward and follow standard JavaScript conventions.

**Other Alternatives**

If you're interested in exploring alternative approaches for converting numbers to strings, here are a few options:

* Using a regex pattern: `let num = 500; let nums = []; nums.push(num.toString().replace(/^[-+]?(?:\d{1,3}(?:,\d{3})*(\.\d+)?)$/g, ''));`
* Using a custom function: You could create your own function for converting numbers to strings. However, this would likely be less efficient than using the built-in `String()` or `.toString()` methods.
* Using WebAssembly (WASM): If you're looking for performance optimization and are willing to invest in setting up a WASM environment, you might consider using WebAssembly's built-in string conversion functions.

Keep in mind that these alternatives are not commonly used or recommended for everyday JavaScript development. The `String()` and `.toString()` methods provide a convenient and efficient way to convert numbers to strings.

Related benchmarks:

Number to String: toString() vs String() vs + "" (version: 0)

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

Created: 4 years ago by: Registered User

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):