Benchmark: Destructuring II

Script Preparation code:

var data = {
    deals: {
        name: 'Deals Name'
    }
}

Tests:

Test
let { deal : { name } = {} } = data; console.log(name)
Test 2
let name = data?.deal?.name console.log(name)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Test
Test 2

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's break down what's happening in this benchmark and explain the different approaches being tested.

**Benchmark Definition**

The benchmark is called "Destructuring II" and it tests two different ways of accessing data within an object using destructuring assignment.

**Script Preparation Code**

The script preparation code sets up a sample JSON object `data` with a nested property `deals`. The property `name` is defined inside the `deals` object.

```javascript
var data = {
  deals: {
    name: 'Deals Name'
  }
}
```

**Html Preparation Code**

There is no HTML preparation code, which means that the benchmark only tests the JavaScript code itself and does not consider any HTML-related factors.

**Individual Test Cases**

There are two test cases:

1. **Test**
```javascript
let { deal: { name } = {} } = data;
console.log(name);
```

This test case uses destructuring assignment with an optional chaining operator (`?.`) to access the `name` property of the `deals` object within the `data` object.

2. **Test 2**
```javascript
let name = data?.deal?.name
console.log(name);
```

This test case also uses optional chaining, but without destructuring assignment. Instead, it directly accesses the `name` property through the dot notation and the optional chaining operator (`?`).

**What are the options being compared?**

The two test cases compare the performance of using destructuring assignment with an optional chaining operator versus using only optional chaining.

**Pros and Cons of each approach:**

1. **Destructuring Assignment with Optional Chaining**
	* Pros:
		+ More concise and expressive code
		+ Can be faster because it allows for early returns and shorter chains
	* Cons:
		+ May have a slight performance overhead due to the additional syntax
2. **Optional Chaining only**
	* Pros:
		+ Simple and easy to read code
	* Cons:
		+ May require more verbose code to achieve the same result

**Other considerations:**

The benchmark also considers other factors such as:

* The use of `var` vs `let` or `const` for variable declarations (which is not present in this example)
* Function call overhead (not applicable here since we're only testing simple assignments)

**Library and its purpose:**

There are no explicit libraries being used in the benchmark, but if you look closely, the use of optional chaining (`?.`) might be considered a part of the ECMAScript 2020 standard library.

**Special JS feature or syntax:**

The use of optional chaining (`?.`) is a relatively new feature introduced in ECMAScript 2018 (ES2018), which allows for safe navigation and early returns. This feature was widely adopted after its introduction and has become a popular way to handle null or undefined values in JavaScript.

**Alternatives:**

If you're interested in running similar benchmarks, here are some alternatives:

* js-bench: A benchmarking framework specifically designed for Node.js.
* BenchmarkJS: A comprehensive benchmarking framework that supports various programming languages and test cases.
* micro-benchmark: A lightweight benchmarking library that allows for easy creation of micro-benchmarks.

Keep in mind that the choice of benchmarking framework will depend on your specific use case, performance requirements, and target platform.

Related benchmarks:

Destructuring II (version: 0)

Comparing performance of: Test vs Test 2

Created: 4 years ago by: Guest

Jump to the latest result

Test

Test 2

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):