Benchmark: String double reverse

Script Preparation code:

var str = 'olleH dlrow fo tpircsavaJ htiw srekooh ni a racecar';

function straightPass(s){
  var l = s.length;
  var buf = '',
  res = '';
  for(var i=0; i<l; i++){
    if(s[i] !== ' '){
      res += (buf + s[i]);
      buf = '';
      continue
    }
    buf = s[i]+buf;
    if(i == l-1) res += buf
  }

  return res;
}

function stdFunctions(s){
  var res=[]
  var arr=s.split(' ')
  
  for(var i in arr){
    var word = arr[i]
    var wordA= word.split('').reverse().join('')
    res.push(wordA)
  }

  return res.join(' ')
}

Tests:

Straight pass
straightPass(str);
Using std Array / String functions
stdFunctions(str)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Straight pass
Using std Array / String functions

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

**Benchmark Overview**

The provided JSON represents a JavaScript microbenchmark test case on the MeasureThat.net website. The benchmark measures the performance of two approaches for reversing each word in a given string.

**Script Preparation Code**

The script preparation code defines two functions:

1. `straightPass(s)`: This function reverses each word in the input string `s` by iterating through the characters, and whenever a non-space character is encountered, it appends the current buffer (`buf`) to the result (`res`) and resets the buffer.
2. `stdFunctions(s)`: This function uses standard JavaScript array and string functions to reverse each word in the input string `s`. It splits the string into words, reverses each word using `split('')`, `reverse()`, and `join('')`, and then joins the reversed words back together with spaces.

**Benchmark Definition**

The benchmark definition specifies two test cases:

1. **Straight pass**: This test case measures the performance of the `straightPass(s)` function.
2. **Using std Array / String functions**: This test case measures the performance of the `stdFunctions(s)` function.

**Comparison of Approaches**

Here's a comparison of the two approaches:

**Pros and Cons:**

1. `straightPass(s)`: Pros:
	* Simple, iterative approach with minimal overhead.
	* Can be optimized for specific use cases or hardware configurations.
Cons:
	* May have higher overhead due to the manual buffer management and string manipulation.
2. `stdFunctions(s)`: Pros:
	* Utilizes standard JavaScript functions that are widely supported and optimized.
	* Less prone to errors and bugs compared to a custom implementation.
Cons:
	* May be slower due to the overhead of creating arrays, manipulating strings, and calling built-in functions.

**Other Considerations**

1. **Memory usage**: The `straightPass(s)` function may have higher memory usage due to the use of a buffer (`buf`) to accumulate characters, while the `stdFunctions(s)` function uses arrays and string manipulation that can lead to higher memory allocation and deallocation.
2. **Cache locality**: The `straightPass(s)` function's iterative approach may have better cache locality due to the sequential access of characters, while the `stdFunctions(s)` function's use of arrays and string manipulation may lead to more cache misses.

**Library Usage**

None of the provided functions rely on any external libraries.

**Special JS Features/Syntax**

Neither of the provided functions utilizes any special JavaScript features or syntax. They are standard JavaScript implementations that should be compatible with most modern browsers.

**Alternatives**

Other approaches to reverse each word in a string could include:

1. Using regular expressions: This approach can be more efficient for large strings but may have higher overhead due to the use of regex engines.
2. Using a library like `lodash` or `underscore`: These libraries provide optimized functions for string manipulation and array operations that can improve performance.

Note that the choice of approach depends on the specific requirements, constraints, and optimization goals of the project.

Related benchmarks:

String double reverse (version: 0)

Two solutions of the simple problem: reverse each word in the line.

Comparing performance of: Straight pass vs Using std Array / String functions

Created: 7 years ago by: Registered User

Jump to the latest result

Straight pass

Using std Array / String functions

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):