Benchmark: Destructure vs Assign

Tests:

test and assign individual
const pixelArray = [5,[1,6],9,[1,8],7,[1,3],4,[1,3],6,[1,2],6,[1,2],6,[1,2],6,[1,2],6,[1,2],6,[1,2],6,[1,2],6,[1,2],6,[1,2],6,[1,2],6,[1,10],6,[1,10],6,[1,2],6,[1,2],6,[1,2],6,[1,2],6,[1,2],6,[1,2],6,[1,2],6,[1,2],35] pixelArray.forEach(item=>{ let color, count if (Array.isArray(item)) { color = item[0] count = item[1] } else { color = 0 count = item } color += count /* code */ })
destructure
const pixelArray = [5,[1,6],9,[1,8],7,[1,3],4,[1,3],6,[1,2],6,[1,2],6,[1,2],6,[1,2],6,[1,2],6,[1,2],6,[1,2],6,[1,2],6,[1,2],6,[1,2],6,[1,10],6,[1,10],6,[1,2],6,[1,2],6,[1,2],6,[1,2],6,[1,2],6,[1,2],6,[1,2],6,[1,2],35] pixelArray.forEach(item=>{ let [color, count] = Array.isArray(item) ? item : [0, item] color += count /* code */ })

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
test and assign individual
destructure

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser/OS: Chrome 129 on Windows

View result in a separate tab

Test name	Executions per second
test and assign individual	225134.4 Ops/sec
destructure	211875.7 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark is defined by a JSON object that provides basic metadata, such as the name and description of the benchmark. In this case, the benchmark is named "Destructure vs Assign" and has no description.

**Script Preparation Code and Html Preparation Code**

Since there are no script preparation code or html preparation code provided, we'll assume that they are not being used in this benchmark.

**Individual Test Cases**

The benchmark consists of two individual test cases:

1. **test and assign individual**
This test case uses the traditional approach of assigning values to variables inside a loop. The JavaScript code is as follows:
```javascript
pixelArray.forEach(item=>{
    let color, count
    if (Array.isArray(item)) {
        color = item[0]
        count = item[1]
    } else {
        color = 0
        count = item
    }
    color += count
    /* code */
})
```
In this approach, the `color` and `count` variables are declared inside the loop using the `let` keyword. The values of these variables are assigned based on whether the current item is an array or not.

2. **destructure**
This test case uses the destructuring syntax to assign values to variables inside a loop. The JavaScript code is as follows:
```javascript
pixelArray.forEach(item=>{
    let [color, count] = Array.isArray(item) ? item : [0, item]
    color += count
    /* code */
})
```
In this approach, the `color` and `count` variables are declared using the destructuring syntax. The values of these variables are assigned based on whether the current item is an array or not.

**Library**

There is no explicit library mentioned in the benchmark definition. However, it's likely that the benchmark uses the built-in `Array.prototype.forEach()` method to iterate over the `pixelArray`.

**Special JS Feature/Syntax**

The destructuring syntax used in the second test case (`destructure`) is a special JavaScript feature introduced in ECMAScript 2015 (ES6). It allows for more concise way of assigning values to variables based on the structure of an array or object.

**Pros and Cons**

Here are some pros and cons of each approach:

**Test and Assign Individual**

Pros:

* Wide support across older browsers
* Easy to understand and maintain

Cons:

* Can lead to slower performance due to unnecessary variable declarations

**Destructure**

Pros:

* More concise and expressive code
* Improved performance due to reduced overhead from unnecessary variables

Cons:

* May not work as expected in older browsers that don't support ES6+ features
* Requires more knowledge of the syntax to understand and maintain

**Other Alternatives**

If you're looking for alternative approaches, here are a few options:

1. **Use `map()` instead of `forEach()`**: If you need to perform some operation on each item in an array, using `map()` can be faster and more memory-efficient.
2. **Use `for...of` loop**: If you prefer a more traditional approach, using a `for...of` loop can provide better control over the iteration process.
3. **Avoid unnecessary variables**: Try to minimize the use of unnecessary variables and instead directly assign values to your desired output.

I hope this explanation helps!

Related benchmarks:

Destructure vs Assign (version: 0)

Comparing performance of: test and assign individual vs destructure

Created: one year ago by: Guest

Jump to the latest result

test and assign individual

destructure

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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