Benchmark: Assignment of value vs Destructuring an object (direct assign insted of variable )

Tests:

Assign
const obj = {a: { e: { i: 6 } } }; console.log(obj.a.e.i);
Destructure
const obj = {a: { e: { i: 6 } } }; const { i } = obj.a.e; console.log(i);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Assign
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/127.0.0.0 Safari/537.36 Edg/127.0.0.0

Browser/OS: Chrome 127 on Windows

View result in a separate tab

Test name	Executions per second
Assign	396414.6 Ops/sec
Destructure	396340.6 Ops/sec

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

LLMs can make mistakes. Check important info.

Measuring the performance of JavaScript microbenchmarks is crucial for developers to optimize their code and ensure it runs efficiently.

Let's break down what's being tested in the provided JSON:

**Benchmark Definition**: The first benchmark definition tests two approaches: assigning a value directly (`Assign`) versus destructuring an object using a variable (`Destructure`).

**Options Compared**:

1. **Direct Assignment (Assign)**:
	* This approach assigns the value `i` from the nested object `obj.a.e` to a local variable without declaring it first.
	* It's a simple and straightforward way to access nested properties in JavaScript.
2. **Destructuring with Variable (Destructure)**:
	* This approach uses destructuring syntax (`const { i } = obj.a.e;`) to extract the `i` property from the object without assigning it to a variable first.
	* It's a more concise and expressive way to access nested properties in JavaScript.

**Pros and Cons of Each Approach**:

1. **Direct Assignment (Assign)**:
	* Pros: Simple, fast, and easy to read.
	* Cons: Can lead to unexpected behavior if the property is not present or has a different type.
2. **Destructuring with Variable (Destructure)**:
	* Pros: More concise, safer (less prone to errors), and easier to understand for developers familiar with destructuring syntax.
	* Cons: May be slightly slower due to the overhead of creating a variable.

**Library Usage**: There is no explicit library mentioned in the benchmark definition. However, it's likely that the JavaScript engine being tested (e.g., V8) uses some internal libraries or mechanisms to optimize performance.

**Special JS Features/Syntax**: The benchmarks use destructuring syntax (`const { i } = obj.a.e;`), which is a modern JavaScript feature introduced in ECMAScript 2015 (ES6). This syntax allows for more concise and expressive way of accessing nested properties, making the code easier to read and maintain.

**Alternatives**:

1. **Using bracket notation**: `obj["a"]["e"]["i"]` or `obj.a.e.i` is another way to access nested properties in JavaScript.
2. **Using a temporary variable**: `const temp = obj.a.e; temp.i;` is another alternative, similar to the `Assign` approach.

In summary, the benchmark tests the performance of two approaches for accessing nested properties in JavaScript: direct assignment and destructuring with a variable. The results will help developers understand which approach is faster and more efficient in their code.

Related benchmarks:

Assignment of value vs Destructuring an object (direct assign insted of variable ) (version: 0)

Comparing performance of: Assign vs Destructure

Created: one year ago by: Guest

Jump to the latest result

Assign

Destructure

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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