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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
Go to the latest result
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>
Run tests (2)
Previous results
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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
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<iframe src="https://measurethat.net/Embed?id=538472" width="100%" height="500px"></iframe>
Assign
396K/s
Destructure
396K/s
View exact numbers
Test name
Executions per second
✓
Assign
396,415 Ops/sec
Destructure
396,341 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
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.
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Variable assignment from object | traditional vs destructuring
Assignment of value vs Destructuring an object
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