Benchmark: Object.assign vs spread operatora

Tests:

Object.assign
var params = { a: [1,2,3], b: { c: { d: [1,2,3]}}} var other = Object.assign({}, params);
spread operator
var params = { a: [1,2,3], b: { c: { d: [1,2,3]}}} var other = { ...params };

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.assign
spread operator

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

The benchmark in question is designed to compare the performance of two approaches for merging objects: `Object.assign()` and the spread operator (`...`). Here's what's being tested:

**What's being compared?**

The benchmark compares the execution time of two methods:

1. **`Object.assign()`**: This method takes an optional source object and assigns its enumerable properties to a target object.
2. **Spread Operator (`...`)**: This syntax creates a new object by spreading the properties of another object.

**Options being compared**

There are two options being compared:

* `Object.assign()`: The traditional method for merging objects, which creates a shallow copy of the source object's properties and assigns them to the target object.
* Spread Operator (`...`): A newer syntax that allows you to create a new object by spreading the properties of another object.

**Pros and Cons**

Here are some pros and cons of each approach:

* **`Object.assign()`**:
	+ Pros: Wide browser support, well-established method, easy to use.
	+ Cons: Creates a shallow copy, can lead to unexpected behavior if not used carefully (e.g., when dealing with non-enumerable properties).
* Spread Operator (`...`):
	+ Pros: More concise and readable, creates a deep copy of the source object's properties, handles non-enumerable properties correctly.
	+ Cons: Less widely supported in older browsers, may require additional work for certain use cases.

**Library or special JS feature**

Neither `Object.assign()` nor the spread operator uses any external libraries. These are built-in JavaScript features.

**Special JS feature (if applicable)**

This benchmark does not rely on any special JavaScript features like async/await, Promises, or Web Workers. It only uses standard JavaScript syntax and built-in methods.

**Other alternatives**

If you're interested in exploring alternative approaches for merging objects, some options include:

* Using a library like Lodash's `merge()` function
* Implementing your own custom merge function
* Using a data structure like a Map or an object literal with nested properties

Keep in mind that these alternatives may have their own trade-offs and performance characteristics.

I hope this explanation helps you understand the benchmark and its design!

Related benchmarks:

Object.assign vs spread operatora (version: 0)

Comparing performance of: Object.assign vs spread operator

Created: 7 years ago by: Guest

Jump to the latest result

Object.assign

spread operator

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):