Benchmark: joined map or concatenate

Script Preparation code:

formatters = [
  () => 'a',
  () => 'bcd',
  () => 'ef',
  () => 'ghijk',
  () => 'lmn',
  () => 'o',
  () => 'pg',
  () => 'rst'
]

Tests:

concatenation
let text = '' for (let i = 1, l = formatters.length; i < l; ++i) { text += formatters[i]() }
joined map
let text = formatters.map(f => f()).join('')

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
concatenation
joined map

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 benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark is defined in JSON format, which describes two different approaches to concatenating strings:

1. **Concatenation**: This approach uses a `for` loop to concatenate strings using the `+=` operator.
2. **Joined Map**: This approach uses the `map()` function to apply a transformation to each string in an array and then joins the resulting array into a single string using the `join()` method.

**Options Compared**

The benchmark compares two options:

1. **Concatenation (using a for loop)**: This approach is simple and straightforward, but it can be slow due to the overhead of function calls and string concatenations.
2. **Joined Map**: This approach uses higher-order functions (`map()` and `join()`) to abstract away the iteration and concatenation logic.

**Pros and Cons**

* **Concatenation (using a for loop)**:
	+ Pros: Simple, easy to understand, and well-supported by most browsers.
	+ Cons: Can be slow due to function calls and string concatenations.
* **Joined Map**:
	+ Pros: More concise, can take advantage of optimized implementations in modern browsers, and can handle large datasets efficiently.
	+ Cons: May have a steeper learning curve due to the use of higher-order functions.

**Library Used**

In this benchmark, no external libraries are used. The `map()` function is a built-in JavaScript method that applies a transformation to each element in an array.

**Special JS Feature or Syntax**

There are no special JS features or syntax used in this benchmark. The code is written in standard JavaScript and uses only the built-in functions and methods described above.

**Other Alternatives**

If you want to try alternative approaches, here are some options:

1. **Using `Array.prototype.reduce()`**: Instead of using a `for` loop or `map()`, you can use the `reduce()` method to concatenate strings.
2. **Using a string buffer**: You can use a string buffer library (e.g., `buffer.js`) to concatenate strings more efficiently.
3. **Using a different data structure**: Depending on your specific requirements, you might want to experiment with other data structures like arrays or sets.

Here's an example of how you could rewrite the benchmark using `Array.prototype.reduce()`:
```javascript
let text = formatters.reduce((acc, f) => acc + f(), '');
```
Keep in mind that this approach is similar to concatenation using a `for` loop and may not be significantly faster.

Related benchmarks:

joined map or concatenate (version: 0)

Is joining a map faster than concatenating to a string?

Comparing performance of: concatenation vs joined map

Created: 3 years ago by: Guest

Jump to the latest result

concatenation

joined map

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):