Benchmark: concat VS + VS +=

Tests:

+=
let str = ''; const times = 1000; for(let i = 0; i <= times; i++) { str += 'a'; }
+
let str = ''; const times = 1000; for(let i = 0; i <= times; i++) { str = str + 'a'; }
concat
let str = ''; const times = 1000; for(let i = 0; i <= times; i++) { str = str.concat('a'); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
+=
+
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.

Let's break down the provided benchmark and explain what is being tested, compared, and discussed.

**Benchmark Definition:**
The benchmark definition provides a script template that defines three variations of string concatenation:

1. `concat`: Uses the built-in `concat()` method to concatenate strings.
2. `+=`: Uses the addition assignment operator (`+=`) with the `+` operator to concatenate strings.
3. `+`: Simply uses the `+` operator without any additional operators.

These three variations aim to test different approaches for string concatenation in JavaScript.

**Test Cases:**
The benchmark consists of three individual test cases, each representing one of the above-mentioned variations:

1. `concat`: Tests using the built-in `concat()` method.
2. `+=`: Tests using the addition assignment operator (`+=`) with the `+` operator.
3. `+`: Tests simply using the `+` operator without any additional operators.

**Library and Syntax Used:**
The benchmark uses JavaScript as its programming language, which is a high-level, dynamic language for the web.

There are no special JS features or syntax used in this benchmark.

**Pros and Cons of Different Approaches:**

1. **concat() method**:
	* Pros: Efficient, reliable, and widely supported.
	* Cons: May have performance implications due to overhead from function calls.
2. **+= operator**:
	* Pros: Simple, readable, and efficient for small string concatenations.
	* Cons: May lead to unexpected behavior or errors if not used carefully (e.g., with null or undefined values).
3. **+ operator without additional operators**:
	* Pros: Minimal overhead, easy to understand.
	* Cons: May be slower than the other two approaches due to repeated string allocations.

**Other Alternatives:**

1. **String interpolation**: Some modern JavaScript engines (e.g., ES6+) support template literals (`${expression}`), which can improve performance and readability for large string concatenations.
2. **Immutable data structures**: Using immutable data structures, like arrays or objects, can provide a more predictable and performant way to concatenate strings.

**Benchmark Result:**
The latest benchmark result shows the execution per second (ExecutionsPerSecond) for each test case on a specific browser and device platform. The results suggest that:

* `+=` is slightly faster than `concat()`.
* `+` is slower than both `concat()` and `+=`.

Please note that these results may vary depending on the specific use case, environment, and hardware.

I hope this explanation helps you understand what's being tested in this benchmark!

Related benchmarks:

concat VS + VS += (version: 0)

Comparing performance of: += vs + vs concat

Created: 7 years ago by: Guest

Jump to the latest result

+=

+

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):