Benchmark: Object.assign vs spread operator screw jquery

Tests:

Object.assign
var params = { b:"hello", c: true, d:7 }; var other = Object.assign({ a: 2 }, params);
spread operator
var params = { b:"hello", c: true, d:7 }; var other = { a: 2, ...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

Latest run results:

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

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Let's dive into the world of JavaScript microbenchmarks.

**Benchmark Definition and Script Preparation Code**

The benchmark definition json contains two test cases: `Object.assign` and `spread operator`. The script preparation code is empty, which means that no additional setup or configuration is required for each test case. This allows us to focus on the actual testing of the JavaScript features.

**Individual Test Cases**

There are two test cases:

1. **`Object.assign`**: This test case uses the `Object.assign()` method to merge two objects. The benchmark definition code:
```javascript
var params = { b: "hello", c: true, d: 7 };
var other = Object.assign({ a: 2 }, params);
```
This test case is designed to measure the performance of the `Object.assign()` method in merging objects.

2. **`spread operator`**: This test case uses the spread operator (`...`) to merge two objects. The benchmark definition code:
```javascript
var params = { b: "hello", c: true, d: 7 };
var other = { a: 2, ...params };
```
This test case is designed to measure the performance of using the spread operator for object merging.

**Options Compared**

In this benchmark, we have two options being compared:

* **`Object.assign()`**: This method creates a new object with the properties of the source object (`params`) and merges it with the existing object (`{ a: 2 }`).
* **Spread Operator (`...`)**: This operator creates a new object with the keys from `params` and assigns the values from `params` to those keys in the target object (`{ a: 2, ...params }`).

**Pros and Cons of Each Approach**

Here are some pros and cons of each approach:

* **`Object.assign()`**:
	+ Pros:
		- Wide browser support
		- Fast execution
	+ Cons:
		- Can be slower due to the overhead of creating a new object
		- Less intuitive for some developers
* **Spread Operator (`...`)**:
	+ Pros:
		- More concise and expressive
		- Faster execution (thanks to inlining by modern browsers)
	+ Cons:
		- Limited browser support (older versions may not support it)
		- May not work as expected in some edge cases

**Library Usage**

There is no explicit library usage mentioned in this benchmark. However, the `Object.assign()` method uses the `Array.prototype.concat` and `Array.prototype.slice` methods internally, which are built-in methods.

**Special JS Features or Syntax**

No special JavaScript features or syntax are used in this benchmark. The code only uses standard JavaScript syntax and built-in methods.

**Other Alternatives**

If you're looking for alternative methods to merge objects, here are a few options:

* **`Object.create()`**: Creates a new object with the specified prototype.
* **`Array.prototype.push.apply()`**: Concatenates arrays using `push()`.
* **`Array.prototype.reduce()`**: Reduces an array by applying a function to each element.

Keep in mind that these alternatives may have different performance characteristics and usage scenarios compared to `Object.assign()` and the spread operator.

Related benchmarks:

Object.assign vs spread operator screw jquery (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):