Benchmark: For + []= VS For-Of + []= VS For + Push VS For-Of + Push VS Map, Destructuring VS Indices

For + []= VS For-Of + []= VS For + Push VS For-Of + Push VS Map, Destructuring VS Indices (version: 0)

Comparing performance of: For + []=, Destructuring vs For + []=, Indices vs For-Of + []=, Destructuring vs For-Of + []=, Indices vs For + Push, Destructuring vs For + Push, Indices vs For-Of + Push, Destructuring vs For-Of + Push, Indices vs Map, Destructuring vs Map, Indices

Created: 4 years ago by: Guest

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Script Preparation code:

var pairs = Array.from(new Array(10000)).map(() => ["as", "df"]);
var result;

Tests:

For + []=, Destructuring
result = []; for (var i = 0; i < pairs.length; i++) { var [a, b] = pairs[i]; result[i] = a + b; }
For + []=, Indices
result = []; for (var i = 0; i < pairs.length; i++) { result[i] = pairs[i][0] + pairs[i][1]; }
For-Of + []=, Destructuring
result = []; for (var [a, b] of pairs) { result[i] = a + b; }
For-Of + []=, Indices
result = []; for (var pair of pairs) { result[i] = pair[0] + pair[1]; }
For + Push, Destructuring
result = []; for (var i = 0; i < pairs.length; i++) { var [a, b] = pairs[i]; result.push(a + b); }
For + Push, Indices
result = []; for (var i = 0; i < pairs.length; i++) { result.push(pairs[i][0] + pairs[i][1]); }
For-Of + Push, Destructuring
result = []; for (var [a, b] of pairs) { result.push(a + b); }
For-Of + Push, Indices
result = []; for (var pair of pairs) { result.push(pair[0] + pair[1]); }
Map, Destructuring
result = pairs.map(([a, b]) => a + b);
Map, Indices
result = pairs.map(pair => pair[0] + pair[1]);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
For + []=, Destructuring
For + []=, Indices
For-Of + []=, Destructuring
For-Of + []=, Indices
For + Push, Destructuring
For + Push, Indices
For-Of + Push, Destructuring
For-Of + Push, Indices
Map, Destructuring
Map, Indices

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 Overview**

The benchmark measures the performance of different ways to iterate over an array in JavaScript, comparing four approaches:

1. **For + []= (Destructuring)**: Using a `for` loop with destructuring assignment (`var [a, b] = pairs[i];`)
2. **For-Of + []= (Destructuring)**: Similar to the previous one, but using the `for...of` loop syntax.
3. **For + Push**: Iterating over the array and pushing elements onto a new array using the `push()` method.
4. **For-Of + Push**: Similar to the previous one, but iterating over the array and pushing elements onto a new array.

**Key Insights**

1. The `for...of` loop is generally faster than the traditional `for` loop when used with destructuring assignment.
2. Using the `push()` method can lead to slower performance compared to other approaches.
3. Destructuring assignment (`var [a, b] = pairs[i];`) is often faster than assigning individual values using bracket notation (`var a = pairs[i].a; var b = pairs[i].b;`).

**Recommendations**

Based on the benchmark results, here are some recommendations:

* Use `for...of` loops with destructuring assignment for optimal performance.
* Avoid using the `push()` method when possible.
* If you must use the `push()` method, consider using an array-like object (e.g., `Array.prototype.slice()`) to improve performance.

**Context**

Keep in mind that these results are specific to this particular benchmark and might not generalize to other scenarios. Factors like array size, element type, and JavaScript engine can influence performance. Additionally, the importance of optimizing for iteration speed may vary depending on your use case and requirements.

I hope this helps! Do you have any specific questions or areas you'd like me to expand upon?

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