Benchmark: destruct vs index

Script Preparation code:

var listaCesar = [["cesar", "1", 1], ["thiago", "2", 2], ["giuseppe", "3", 3]]

Tests:

destruct
var dict = listaCesar.map(([name, id, age]) => ({ name, id, age }))
index
var dict = [] listaCesar.forEach(item => dict.push({name: item[0], id: item[1], age: item[2]}))

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
destruct
index

Fastest: N/A

Slowest: N/A

Latest 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 provided benchmark and explain what is being tested.

**Benchmark Definition**

The benchmark is defined by two test cases: "destruct" and "index". The script preparation code for both test cases is the same, which is an array `listaCesar` containing three elements. However, the HTML preparation code is empty, indicating that this might be a microbenchmark focusing on JavaScript execution speed.

**Options Compared**

The two test cases differ in how they create a new object from the `listaCesar` array:

1. **Destructuring (destruct)**:
   ```javascript
var dict = listaCesar.map(([name, id, age]) => ({ name, id, age }));
```
   This approach uses the `map()` method and destructuring to create a new object for each element in the array.

2. **Index-based iteration (index)**:
   ```javascript
var dict = [];
listaCesar.forEach(item => dict.push({name: item[0], id: item[1], age: item[2]}));
```
   This approach uses `forEach()` and index-based iteration to create a new object for each element in the array.

**Pros and Cons**

### Destructuring (destruct)

Pros:

* More concise and expressive code.
* Can be faster due to fewer function calls and less memory allocation.

Cons:

* Requires modern JavaScript support (ECMAScript 2015+).
* Might not work as expected if the array elements do not match the destructured names.

### Index-based iteration (index)

Pros:

* Works with older JavaScript versions.
* Does not rely on specific array element names.

Cons:

* More verbose code, which can lead to errors due to typos or index out-of-bounds issues.
* May be slower due to more function calls and memory allocation.

**Library/Feature Used**

There is no library explicitly mentioned in the benchmark. However, modern JavaScript features like destructuring (ECMAScript 2015+) are used.

**Special JS Feature/Syntax**

No special JavaScript feature or syntax is used beyond what's typically available in recent versions of JavaScript.

**Other Alternatives**

For creating objects from arrays, other approaches could be:

* Using `Array.prototype.reduce()` instead of `map()` and destructuring.
* Employing a custom loop with indexing to create each object individually.
* Utilizing libraries like Lodash or Underscore.js for array manipulation and object creation.

However, given the focus on JavaScript execution speed and simplicity, the provided benchmark seems to target the performance difference between these two approaches.

Related benchmarks:

destruct vs index (version: 0)

Comparing performance of: destruct vs index

Created: 3 years ago by: Guest

Jump to the latest result

destruct

index

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):