Benchmark: string_concat_vs_append

Tests:

string_append
const a = 'hello', b = 'world', c = a + b;
string_concat
const a = 'hello', b = 'world', c = a.concat(b);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
string_append
string_concat

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

I'd be happy to explain the benchmark and its options.

**What is being tested?**

The benchmark is testing the performance difference between two approaches for concatenating strings in JavaScript:

1. Using the `+` operator (string appends)
2. Using the `concat()` method (string concatenates)

In other words, the benchmark measures how fast it is to concatenate two strings using either of these methods.

**Options compared**

The two options being compared are:

* **String Appends (`a + b`)**: This approach uses the `+` operator to concatenate two strings. It creates a new string by adding the characters of both input strings.
* **String Concatenation (`a.concat(b)`)**: This approach uses the `concat()` method to concatenate two strings. It returns a new string that is the result of concatenating the input strings.

**Pros and Cons**

Here are some pros and cons of each approach:

* **String Appends (`+` operator)**:
	+ Pros:
		- Typically faster, since it avoids creating an intermediate array.
		- Easier to understand and write in many situations.
	+ Cons:
		- Can lead to temporary objects being created on the heap if used inside a loop.
		- May not be suitable for very large strings or performance-critical code.
* **String Concatenation (`concat()` method)**:
	+ Pros:
		- Less prone to temporary object creation issues (e.g., when concatenating many strings).
		- Can be more suitable for performance-critical code that needs to handle large strings.
	+ Cons:
		- Typically slower, since it involves creating an intermediate array and then copying its contents into a new string.

**Library usage**

In neither of the provided benchmark definitions is any library used. However, if a library like Lodash were used, the `concat()` method would likely be called on an instance of the Lodash `string` utility, which provides various string concatenation functions.

**Special JS features or syntax**

There are no special JavaScript features or syntax mentioned in the provided benchmark definitions. They appear to use standard JavaScript syntax and don't include any advanced concepts like async/await, Promises, or decorators.

**Other alternatives**

If you wanted to test other approaches for concatenating strings, some alternative methods could be:

* Using a template string (e.g., `${a} ${b}`) instead of the `+` operator.
* Creating an array and then joining its elements with a separator (e.g., `[a, b].join('')`).
* Using a StringBuilder-like library or implementation (if desired).

However, for most use cases, using the `+` operator or the `concat()` method is sufficient, and these alternatives may not provide significant performance benefits.

Related benchmarks:

string_concat_vs_append (version: 0)

Concatenation of two strings.

Comparing performance of: string_append vs string_concat

Created: 3 years ago by: Guest

Jump to the latest result

string_append

string_concat

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):