Benchmark: Slowest character conversion

Script Preparation code:

const alphabet = ["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"];


function generateItems(numberOfItems){
    const result = [];
    for ( var i = 0; i < numberOfItems ; i++ ) {
        result.push( alphabet[Math.floor(Math.random() * alphabet.length)]);
    }
    return result;
}

const list = generateItems(1000000);

​x
 
const alphabet = ["A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"];​​function generateItems(numberOfItems){    const result = [];    for ( var i = 0; i < numberOfItems ; i++ ) {        result.push( alphabet[Math.floor(Math.random() * alphabet.length)]);    }    return result;}​const list = generateItems(1000000);

Tests:

Initial call

function myFunc(){
    for(let i = 0; i < list.length -1; i ++){
        list[i] = list[i].toLowerCase()
    }
}

 
function myFunc(){    for(let i = 0; i < list.length -1; i ++){        list[i] = list[i].toLowerCase()    }}

Multiple calls

function myFunc(){
    for(let i = 0; i < list.length -1; i ++){
        list[i] = list[i].toLowerCase()
    }
   	for(let i = 0; i < list.length -1; i ++){
        list[i] = list[i].toLowerCase()
    }
   	for(let i = 0; i < list.length -1; i ++){
        list[i] = list[i].toLowerCase()
    }
}

 
function myFunc(){    for(let i = 0; i < list.length -1; i ++){        list[i] = list[i].toLowerCase()    }    for(let i = 0; i < list.length -1; i ++){        list[i] = list[i].toLowerCase()    }    for(let i = 0; i < list.length -1; i ++){        list[i] = list[i].toLowerCase()    }}

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Experimental features:

Memory measurements supported only in Chrome.
For precise memory measurements Chrome must be launched with --enable-precise-memory-info flag.
More information: Monitoring JavaScript Memory

Test case name	Result
Initial call
Multiple calls

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.85 Safari/537.36

Browser/OS: Chrome 90 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Initial call	881426624.0 Ops/sec
Multiple calls	885384704.0 Ops/sec

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

Let's break down the provided benchmark definition and test cases.

Benchmark Definition:

The benchmark measures the performance of converting characters to lowercase in JavaScript. The benchmark defines a script with two functions:

generateItems(numberOfItems): generates an array of uppercase letters, each randomly selected from the alphabet.
myFunc(): loops through the generated list and converts each character to lowercase.

The script preparation code sets up the alphabet array and the list variable, which is generated by calling generateItems(1000000). The HTML preparation code is empty.

Test Cases:

There are two test cases:

Initial call: This test case runs the myFunc() function only once.
Multiple calls: This test case runs the myFunc() function multiple times.

Options Compared:

The benchmark compares the performance of calling myFunc() with and without additional loop iterations. The main options being compared are:

Number of loop iterations in myFunc(): 1 (Initial call) vs 3 (Multiple calls)

Pros and Cons:

Single loop iteration: This approach is simpler to implement and may be faster for smaller inputs, but it may not capture the full behavior of the function.
Multiple loop iterations: This approach provides a more realistic scenario and can help identify performance issues with repeated function calls. However, it increases the complexity of the test case.

Library:

The benchmark uses no external libraries. The generateItems function is defined within the script itself.

Special JS Features/Syntax:

None mentioned in this explanation.

Other Considerations:

The benchmark measures the performance of converting characters to lowercase, which is a relatively simple operation.
The use of a large input size (1 million items) increases the performance impact and makes it easier to identify performance issues.
The test cases cover both an initial call and multiple calls, providing a comprehensive view of the function's behavior.

Alternatives:

Some alternative approaches could be:

Using a different data structure or algorithm for generating the list of characters.
Adding additional functionality to the myFunc() function, such as handling errors or edge cases.
Using a profiling tool or benchmarking framework to analyze performance metrics in more detail.

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases.

**Benchmark Definition:**

The benchmark measures the performance of converting characters to lowercase in JavaScript. The benchmark defines a script with two functions:

1. `generateItems(numberOfItems)`: generates an array of uppercase letters, each randomly selected from the alphabet.
2. `myFunc()`: loops through the generated list and converts each character to lowercase.

The script preparation code sets up the `alphabet` array and the `list` variable, which is generated by calling `generateItems(1000000)`. The HTML preparation code is empty.

**Test Cases:**

There are two test cases:

1. **Initial call**: This test case runs the `myFunc()` function only once.
2. **Multiple calls**: This test case runs the `myFunc()` function multiple times.

**Options Compared:**

The benchmark compares the performance of calling `myFunc()` with and without additional loop iterations. The main options being compared are:

* Number of loop iterations in `myFunc()`: 1 (Initial call) vs 3 (Multiple calls)

**Pros and Cons:**

* **Single loop iteration**: This approach is simpler to implement and may be faster for smaller inputs, but it may not capture the full behavior of the function.
* **Multiple loop iterations**: This approach provides a more realistic scenario and can help identify performance issues with repeated function calls. However, it increases the complexity of the test case.

**Library:**

The benchmark uses no external libraries. The `generateItems` function is defined within the script itself.

**Special JS Features/Syntax:**

None mentioned in this explanation.

**Other Considerations:**

* The benchmark measures the performance of converting characters to lowercase, which is a relatively simple operation.
* The use of a large input size (1 million items) increases the performance impact and makes it easier to identify performance issues.
* The test cases cover both an initial call and multiple calls, providing a comprehensive view of the function's behavior.

**Alternatives:**

Some alternative approaches could be:

* Using a different data structure or algorithm for generating the list of characters.
* Adding additional functionality to the `myFunc()` function, such as handling errors or edge cases.
* Using a profiling tool or benchmarking framework to analyze performance metrics in more detail.

Related benchmarks:

Slowest character conversion (version: 0)

Comparing performance of: Initial call vs Multiple calls

Created: 3 years ago by: Guest

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