Benchmark: + '' vs .toString() v2

Tests:

String()
let nums = []; for(let i = 0; i < 100; ++i) { const val = Math.random() nums.push(val + ''); }
.toString()
let nums = []; for(let i = 0; i < 100; ++i) { const val = Math.random() nums.push(val.toString()); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
String()
.toString()

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

I'll break down the provided JSON and explain what's being tested, compared options, pros and cons of each approach, library usage, special JavaScript features, and alternative approaches.

**Benchmark Overview**

The benchmark measures the performance difference between two approaches: using the `+` operator to concatenate a string with `undefined` (represented as an empty string) versus using the `.toString()` method on a number. The goal is to identify which approach is faster.

**Options Comparison**

Two options are being compared:

1. **Using the `+` operator**: This method concatenates an empty string (`''`) with a random integer generated by `Math.random()`. The result is a new string created by combining two values.
2. **Using `.toString()` method**: This method converts a number to its string representation using the `.toString()` method, which returns a string that represents the number in a specific format.

**Pros and Cons of Each Approach**

1. **`+` operator:**
	* Pros:
		+ Lightweight and simple
		+ Doesn't require an extra method call or object lookup
	* Cons:
		+ Can lead to unexpected results if used with non-numeric types (e.g., `NaN`, `Infinity`)
		+ May have performance implications due to the overhead of concatenation
2. **`.toString()` method:**
	* Pros:
		+ Explicit and unambiguous way to convert numbers to strings
		+ Less likely to cause unexpected results with non-numeric types
	* Cons:
		+ Requires an extra method call, which might incur performance overhead
		+ May be slower due to the additional operation

**Library Usage**

None of the provided benchmarks use any libraries. The only dependency is the JavaScript standard library, which includes the `Math` object and the `.toString()` method.

**Special JavaScript Features (Not Used)**

There are no special JavaScript features or syntaxes being used in these benchmarks.

**Alternative Approaches**

Other approaches to concatenate strings in JavaScript include:

1. **Template literals**: Introduced in ES6, template literals use the `$` symbol followed by an expression enclosed in parentheses.
2. **String concatenation with `+` and a string literal**: This method is similar to the first approach but uses a string literal (`''`) instead of `undefined`.
3. **Using `Number()` to convert to a number before concatenation**: This method converts the result to a number using `Number()` before concatenating it with another value.

These alternative approaches can be used in various scenarios, and their performance implications may vary depending on the specific use case and requirements.

In summary, the benchmark measures the performance difference between using the `+` operator to concatenate a string with an empty string versus using the `.toString()` method on a number. The `+` operator is lightweight but may lead to unexpected results or performance issues, while the `.toString()` method is more explicit but requires an extra method call and might incur additional overhead.

Related benchmarks:

+ '' vs .toString() v2 (version: 0)

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

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

No previous run results

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