Benchmark: Test shitty shit

Script Preparation code:

var a = [0],
    b = [{
        valueOf: function() {
            return 0;
        }
    }];
for (let i = 1; i < 1000000; ++i) {
    a[i] = b[i] = i;
}

Tests:

A sum
let x = 0; for( let i = 0; i < 1000000; ++i ) { x += a[i]; }
b sum
let x = 0; for( let i = 0; i < 1000000; ++i ) { x += b[i]; }
a each
let x = 0; a.forEach(val => x+= val);
b each
let x = 0; b.forEach(val => x+= val);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
A sum
b sum
a each
b each

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.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Definition JSON**

The provided JSON represents a benchmark definition for a test case that measures the performance of adding numbers to an array in different ways. The "Script Preparation Code" section initializes two arrays, `a` and `b`, with `valueOf` functions set to return 0. These functions are used as a way to add a small constant value (0) to each element when iterating over the arrays.

**Options Compared**

The benchmark compares four different approaches:

1. **Manual Loop**: The first test case uses a traditional for loop to iterate over an array and add its elements to another variable (`x`).
2. **forEach() Method**: The second and third test cases use the `forEach()` method to iterate over arrays and add their elements to another variable (`x`). The `forEach()` method is a built-in method in JavaScript that allows iterating over an array without having to index into it.
3. **Array.forEach() with callback function**: These two tests are essentially identical, using the `forEach()` method with a callback function.

**Pros and Cons**

Here's a brief overview of each approach:

* **Manual Loop**:
	+ Pros: straightforward, well-known algorithm
	+ Cons: verbose, can be error-prone if not implemented correctly
* **forEach() Method**:
	+ Pros: concise, easy to read, well-defined behavior
	+ Cons: may incur overhead due to function calls, some older browsers might have issues with `forEach()` method
* **Array.forEach() with callback function**: This is essentially the same as using the `forEach()` method directly. It's a minor variation in syntax.

**Library Usage**

In this benchmark, the `valueOf` function is used on an array element to add a constant value (0) to each element when iterating over it. While not explicitly stated, this behavior is similar to how JavaScript's built-in `Number()` or `Math.trunc()` functions would behave if used in this context.

**Special JS Feature**

There are no special features or syntaxes being tested here. The benchmark focuses on the performance of adding numbers to arrays using different approaches.

**Other Alternatives**

If you were to write a similar benchmark, you might consider testing other iteration methods, such as:

* Using `reduce()` instead of `forEach()`
* Comparing `filter()` with other methods (e.g., manual loop or `forEach()`)
* Testing performance with more complex array operations (e.g., concatenating arrays)

Keep in mind that the specific options and approaches you choose will depend on the nature of your benchmark and the performance characteristics of JavaScript.

Related benchmarks:

Test shitty shit (version: 0)

Comparing performance of: A sum vs b sum vs a each vs b each

Created: 4 years ago by: Guest

Jump to the latest result

A sum

b sum

a each

b each

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):