Benchmark: + '' vs .toString()

Tests:

String()
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.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

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

**Understanding the Benchmark**

The provided JSON represents a microbenchmark test case on MeasureThat.net, comparing two approaches to create an empty string: using the concatenation operator (`+`) and the `toString()` method.

**Approaches Compared**

There are two approaches being compared:

1. **`+ ''`**: This approach uses the concatenation operator (`+`) with a string literal `''`. When used with a number, it converts the number to a string using implicit conversion (e.g., `500 + ''` becomes `"500"`).
2. **`.toString()`**: This approach explicitly calls the `toString()` method on a value, which returns its string representation.

**Pros and Cons**

### `+ ''`

Pros:

* Generally faster than calling `toString()`, as it avoids an additional function call.
* Can be more readable in certain contexts, as the operator itself is a clear indication of concatenation.

Cons:

* Implicit conversion can lead to unexpected behavior if the value being concatenated is not expected to be converted (e.g., if the value is NaN or infinite).
* May not work as expected with certain data types or values (e.g., null, undefined, or non-string values).

### `.toString()`

Pros:

* Explicit and unambiguous, making it easier to understand the intent of the code.
* Can be more robust when working with uncertain or variable inputs.

Cons:

* Generally slower than the concatenation approach due to the additional function call.

**Library and Special JS Features**

There are no libraries being used in this benchmark. Additionally, there are no special JavaScript features mentioned, so no further explanation is required.

**Other Considerations**

When writing code that involves string manipulation or concatenation, it's essential to consider the following:

* Use of implicit conversion can lead to unexpected behavior or errors.
* Always explicitly use `toString()` when working with uncertain or variable inputs to ensure robustness.
* Consider using template literals (e.g., ``${value}``) as an alternative to concatenation for more readable and efficient string manipulation.

**Alternative Approaches**

Other approaches for creating empty strings include:

1. **Using the `String()` constructor**: `new String('')`
2. **Using the `Array()` constructor with an empty array**: `[ ]`

However, in modern JavaScript, using the concatenation operator (`+ '')` or the `toString()` method is generally considered more efficient and readable.

If you're interested in exploring alternative approaches, I can provide more information on these methods.

Related benchmarks:

+ '' vs .toString() (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):