Benchmark: String iteration optimized

HTML Preparation code:

<script>

const text = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.";

</script>

Tests:

Split map
const result = text.split('').map(char => `_${char}`);
For loop
const result = []; for (let i = 0; i < text.length; i++) { const char = text[i]; result[i] = `_${char}` }
For loop optimized
const charCount = text.length; const result = new Array(charCount); for (let i = 0; i < charCount; i++) { result[i] = `_${text[i]}` }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Split map
For loop
For loop optimized

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 3 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:134.0) Gecko/20100101 Firefox/134.0

Browser/OS: Firefox 134 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
Split map	236087.7 Ops/sec
For loop	315730.1 Ops/sec
For loop optimized	332025.5 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

Measuring the performance of JavaScript code is crucial for understanding how different approaches can impact execution speed. The provided benchmark, `String iteration optimized`, tests three different methods to iterate over a string and transform its characters.

**Benchmarked Options:**

1. **`split('').map(char => `_ + char)`**: This method uses the `Array.prototype.map()` function to create a new array with transformed characters. The `split('')` method is used to split the original string into an array of individual characters.
2. **`for (let i = 0; i < text.length; i++) { const char = text[i]; result[i] = `_ + char` }`**: This approach uses a traditional `for` loop to iterate over the string, accessing each character using its index and pushing it onto an array (`result`).
3. **`const charCount = text.length; const result = new Array(charCount); for (let i = 0; i < charCount; i++) { result[i] = `_ + text[i]` }`**: This optimized `for` loop method creates an array of the desired length and then populates it with transformed characters using the string's length as the upper bound.

**Pros and Cons:**

*   **`split('').map(char => `_ + char)`**: 
    *   Pros:
        *   Simple and concise code
        *   Easy to understand for developers familiar with `Array.prototype.map()`
    *   Cons:
        *   May incur additional overhead due to the creation of a temporary array, even though it's not visible in the result set
*   **`for (let i = 0; i < text.length; i++) { const char = text[i]; result[i] = `_ + char` }`**: 
    *   Pros:
        *   More control over memory allocation and access patterns
        *   May be more efficient for large strings due to less overhead from `Array.prototype.map()`
    *   Cons:
        *   More verbose code, making it harder to read and maintain for some developers
*   **`const charCount = text.length; const result = new Array(charCount); for (let i = 0; i < charCount; i++) { result[i] = `_ + text[i]` }`**: 
    *   Pros:
        *   Optimized loop with better performance due to less overhead from `Array.prototype.map()`
        *   More efficient use of memory allocation
    *   Cons:
        *   Less intuitive for developers unfamiliar with the optimized loop pattern

**Library Usage:**

The benchmark doesn't explicitly mention any libraries being used, but it does utilize JavaScript's built-in methods like `split('')`, `Array.prototype.map()`, and `for` loops. However, some benchmarks may use libraries to provide additional functionality or optimize specific parts of the code.

**Special JS Features/Syntax:**

The benchmark doesn't explicitly mention any special features or syntax being used beyond standard JavaScript features. It's essential to consider factors like browser support and potential polyfills when writing benchmarks for cross-browser compatibility.

**Other Alternatives:**

When exploring alternative approaches, you might consider:

*   Using a different string iteration method, such as `Array.prototype.forEach()` or `for...of` loop
*   Applying different types of transformations, like concatenation instead of array manipulation
*   Incorporating more advanced optimization techniques, such as SIMD (Single Instruction, Multiple Data) instructions for parallel processing
*   Utilizing a different programming paradigm, like functional programming with `map()`, `reduce()`, or `filter()`

Related benchmarks:

String iteration optimized (version: 0)

Comparing performance of: Split map vs For loop vs For loop optimized

Created: one year ago by: Guest

Jump to the latest result

Split map

For loop

For loop optimized

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):