Benchmark: Assignment of value vs Destructuring an object lite

Tests:

Assign
const obj = {a: 'stringA', b: 'stringB', c: 'stringC' }; const a = obj.a; console.log(a);
Destructure
const obj = {a: 'stringA', b: 'stringB', c: 'stringC' }; const { a } = obj; console.log(a);

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: 2 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36

Browser/OS: Chrome 119 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Assign	485240.3 Ops/sec
Destructure	475301.7 Ops/sec

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

LLMs can make mistakes. Check important info.

I'll break down the provided benchmark and its options, pros, cons, and considerations.

**Benchmark Overview**

The MeasureThat.net benchmark compares two approaches to assign values in JavaScript: traditional assignment using `const` and destructuring an object.

**Options Compared**

1. **Assignment using `const`**: This approach uses a traditional assignment syntax, where the value of `obj.a` is directly copied into the variable `a`. This method is straightforward but might not be as efficient or safe in some cases.
2. **Destructuring an object**: This approach uses destructuring syntax to extract values from an object. Specifically, it extracts only the value of `obj.a` and assigns it to the variable `a`.

**Pros and Cons**

**Assignment using `const`:**

Pros:

* Easy to read and understand
* Wide support across browsers

Cons:

* May be slower due to string concatenation or DOM operations (if used in a template literal)
* Might not be as efficient for large datasets, as it creates multiple assignments

**Destructuring an object:**

Pros:

* Can be more efficient, especially when working with large datasets, as it reduces the number of assignments
* Often faster due to fewer DOM operations or string concatenation

Cons:

* Requires JavaScript 14+ support (feature introduced in ECMAScript 2020)
* May require explicit type annotations or object initialization for compatibility issues
* Syntax might be less intuitive for developers unfamiliar with destructuring

**Library Considerations**

None.

**Special JS Feature/Syntax**

The test case uses the `const` keyword, which is a fundamental JavaScript feature. No special syntax is required beyond basic understanding of variable declarations and assignment.

**Other Alternatives**

For comparison purposes, MeasureThat.net might consider alternatives like:

1. **Using `let` or `var` instead of `const`:** This would involve testing the performance impact of using mutable variables.
2. **Assigning values directly in a template literal:** This would test if assignment through string interpolation is faster than traditional assignment.
3. **Other object destructuring approaches (e.g., using arrays or maps):** These might provide additional insights into the efficiency and readability benefits of different data structures.

Keep in mind that MeasureThat.net's goal is to create a comprehensive benchmarking platform, so exploring various alternatives can help ensure a more representative picture of performance and readability trade-offs.

Related benchmarks:

Assignment of value vs Destructuring an object lite (version: 0)

Comparing performance of: Assign vs Destructure

Created: 2 years 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):