Benchmark: destructuring vs assign

Tests:

destructuring
let firstObject = { first: "Amol", last: "Khatri" } let secondObject = { first: "Aarya", last: "Khatri" } let final = { ...firstObject, ...secondObject }
assing
let firstObject = { first: "Amol", last: "Khatri" } let secondObject = { first: "Aarya", last: "Khatri" } let final = Object.assign({}, firstObject, secondObject)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
destructuring
assing

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

I'd be happy to explain the benchmark and its results.

**What is being tested?**

The provided benchmark compares two approaches for merging objects in JavaScript:

1. **Destructuring**: This approach uses the spread operator (`...`) to merge the properties of two objects into a new object.
2. **Assignment** (using `Object.assign()`): This approach uses the `Object.assign()` method to create a new object by copying properties from an existing object and merging them with another object.

**Options compared**

The benchmark compares these two approaches:

*   Destructuring
*   Assignment

**Pros and Cons of each approach:**

1.  **Destructuring**:
    *   Pros:
        *   More concise and readable code
        *   Faster execution time (due to less overhead from `Object.assign()`)
    *   Cons:
        *   Not supported in older browsers or environments that don't support the spread operator (`...`)

2.  **Assignment** (`Object.assign()`):
    *   Pros:
        *   More widely supported across different browsers and environments
        *   Can be used with objects of any type (not just simple property merges)
    *   Cons:
        *   Less concise code compared to destructuring
        *   Slower execution time due to the overhead from `Object.assign()`

**Library**

There is no library specifically mentioned in the benchmark definition or results. However, it's worth noting that `Object.assign()` is a built-in method in JavaScript and does not require any external libraries.

**Special JS feature/syntax**

The benchmark uses the spread operator (`...`) to demonstrate destructuring. The spread operator was introduced in ECMAScript 2015 (ES6) as part of the standard library.

**Other alternatives**

There are other approaches for merging objects in JavaScript, such as using `Object.create()` or a custom function. However, these alternatives are not being compared in this benchmark.

Overall, the benchmark provides a simple and concise way to compare the performance of two common approaches for object merging in JavaScript.

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36

Browser/OS: Chrome 79 on Linux

View result in a separate tab

Test name	Executions per second
destructuring	9174874.0 Ops/sec
assing	2892497.5 Ops/sec

Related benchmarks:

destructuring vs assign (version: 0)

Comparing performance of: destructuring vs assing

Created: 4 years ago by: Registered User

Jump to the latest result

destructuring

assing

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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