Benchmark: concat vs plus string

Tests:

Array.prototype.concat
var str1 = "Hello "; var str2 = "world!"; var res = str1.concat(str2);
spread operator
var str1 = "Hello "; var str2 = "world!"; var res = str1+str2;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.prototype.concat
spread operator

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Array.prototype.concat	170804064.0 Ops/sec
spread operator	169480032.0 Ops/sec

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided JSON represents a benchmark that compares the performance of two approaches: concatenating strings using the `+` operator (also known as string interpolation) versus using the `concat()` method.

**Options Compared**

The benchmark tests two options:

1. **String Interpolation (`+`)**: This approach uses the `+` operator to concatenate two strings.
2. **Array.prototype.concat()**: This approach uses the `concat()` method of the Array prototype to concatenate two strings.

**Pros and Cons of Each Approach**

### String Interpolation (`+`)

Pros:

* Simple and concise syntax
* Fast and efficient for small strings

Cons:

* Can lead to unexpected behavior if not used carefully (e.g., concatenating numbers with strings)
* Not suitable for large strings or performance-critical applications

### Array.prototype.concat()

Pros:

* More explicit and readable syntax
* Suitable for large strings or performance-critical applications

Cons:

* May have overhead due to the call to `concat()` method
* Requires creating an empty array to concatenate two strings

**Library**

The benchmark uses the JavaScript engine built into Google Chrome, which provides a V8 JavaScript engine.

There is no specific library used in this benchmark. The focus is on comparing the performance of two basic string concatenation approaches.

**Special JS Features/Syntax**

None mentioned explicitly, but it's worth noting that this benchmark focuses on a fundamental aspect of JavaScript that can be applied to various scenarios, making it relevant and relatable to a wide range of software engineers.

**Other Alternatives**

For similar benchmarks, you might want to consider the following alternatives:

* Using other string concatenation methods, such as using `+` with numbers or `String()` constructor
* Comparing the performance of different JavaScript engines or implementations (e.g., V8 vs. SpiderMonkey)
* Benchmarking the performance of other array operations, such as `push()`, `pop()`, or `splice()`

Keep in mind that the choice of benchmark and approach will depend on your specific goals, target audience, and requirements.

Related benchmarks:

concat vs plus string (version: 0)

Comparing performance of: Array.prototype.concat vs spread operator

Created: 6 years ago by: Guest

Jump to the latest result

Array.prototype.concat

spread operator

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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