Benchmark: String construction from codes

Script Preparation code:

var codes = [ 0x20, 0x30, 0x40, 0x50, 0x60, 0x70 ];

Tests:

String from loop
var length = codes.length, index, identifier = ''; for (index = 0; index < length; index++) { identifier += String.fromCharCode(codes[index]); }
String from rest
var identifier = String.fromCharCode(...codes);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
String from loop
String from rest

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 dive into the world of JavaScript microbenchmarks on MeasureThat.net.

The provided benchmark is designed to test the performance of two approaches for constructing strings in JavaScript: using a loop and using the `String.fromCharCode()` method with rest parameters.

**Benchmark Definition**

The benchmark definition represents a JavaScript code snippet that defines a string construction task. In this case, it's creating a string by concatenating characters from an array `codes`. The script preparation code sets up the `codes` array, which contains Unicode values for characters to be concatenated. The HTML preparation code is empty, indicating no additional setup required.

**Script Preparation Code**
```javascript
var codes = [ 0x20, 0x30, 0x40, 0x50, 0x60, 0x70 ];
```
This code defines an array `codes` containing Unicode values for characters to be concatenated.

**Benchmark Options**

The benchmark tests two approaches:

1. **String from loop**: This approach uses a traditional `for` loop to concatenate the characters.
2. **String from rest**: This approach uses the `String.fromCharCode()` method with rest parameters to create the string.

**Pros and Cons of each approach:**

* **String from loop**:
	+ Pros:
		- Easy to understand and implement for developers familiar with loops.
	+ Cons:
		- Can be slower due to the overhead of the loop control logic.
* **String from rest**: 
	+ Pros:
		- Often faster, as it avoids the overhead of loop control logic.
		- More concise and expressive code.
	+ Cons:
		- May require more developer expertise familiar with rest parameter syntax.

**Library usage**

Neither benchmark definition uses a library. However, some JavaScript engines may use internal libraries or optimizations that can affect performance.

**Special JS feature**

There is no special JS feature used in this benchmark. The focus is on comparing the performance of two straightforward string construction approaches.

**Other alternatives**

If you're looking for alternative approaches to constructing strings, consider:

* Using `Array.prototype.join()` method: This method concatenates all elements in an array into a single string.
* Using `String.prototype.repeat()` method: This method repeats a given string a specified number of times.
* Using template literals (`''`): This feature allows embedding expressions inside double quotes.

Keep in mind that these alternatives might have different performance characteristics and are suited for specific use cases.

Related benchmarks:

String construction from codes (version: 0)

Comparing performance of: String from loop vs String from rest

Created: 7 years ago by: Guest

Jump to the latest result

String from loop

String from rest

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):