Benchmark: Object.assign vs spread -- updated

Tests:

Object.assign
const baseObj = { a: 'test', b: 'rawr', c: 'foo', d: { a: 'one', b: 'two', c: { a: 'three' } } }; const newObj = { name: 'Test' }; Object.assign(baseObj, newObj);
Spread operator
const baseObj = { a: 'test', b: 'rawr', c: 'foo', d: { a: 'one', b: 'two', c: { a: 'three' } } }; const newObj = { name: 'Test' }; const result = { ...baseObj, ...newObj };

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!

**What is tested?**

The provided JSON represents two benchmark test cases:

1. `Object.assign`
2. Spread operator (`...`)

These tests compare the performance of two ways to merge objects in JavaScript.

**Options compared:**

There are two options being compared:

* `Object.assign()`: a method that takes an existing object and updates it with new properties.
* Spread operator (`...`): a syntax that allows creating a new object by copying the properties from another object.

**Pros and Cons of each approach:**

1. **Object.assign()**
	* Pros:
		+ Widely supported and well-documented.
		+ Can handle complex objects with nested properties.
	* Cons:
		+ May have performance overhead due to the method call.
		+ Can be less efficient than spread operator for simple object merges.
2. **Spread operator (`...`)**
	* Pros:
		+ Fast and lightweight.
		+ Easy to read and write.
		+ Supports shallow and deep merging of objects.
	* Cons:
		+ May not work well with complex or deeply nested objects.
		+ Less intuitive for developers unfamiliar with the syntax.

**Library used:**

None is explicitly mentioned in the provided JSON. However, it's worth noting that both `Object.assign()` and spread operator (`...`) are built-in JavaScript features and don't require any external libraries.

**Special JS feature or syntax:**

The spread operator (`...`), introduced in ECMAScript 2015 (ES6), allows creating a new object by copying the properties from another object. It's a concise way to merge objects, but its behavior can be surprising for some developers.

**Benchmark preparation code and test cases:**

The benchmark preparation code is empty, as specified in the JSON. Each test case consists of a `Benchmark Definition` string that describes the object being merged using both methods:

* `Object.assign()`:
```javascript
const baseObj = {
  a: 'test',
  b: 'rawr',
  c: 'foo',
  d: {
    a: 'one',
    b: 'two',
    c: {
      a: 'three'
    }
  }
};

const newObj = {
  name: 'Test'
};

Object.assign(baseObj, newObj);
```
* Spread operator (`...`):
```javascript
const baseObj = {
  a: 'test',
  b: 'rawr',
  c: 'foo',
  d: {
    a: 'one',
    b: 'two',
    c: {
      a: 'three'
    }
  }
};

const newObj = {
  name: 'Test'
};

const result = {
  ...baseObj,
  ...newObj
};
```
**Other alternatives:**

If `Object.assign()` or spread operator (`...`) are not suitable for your use case, you may consider using other methods, such as:

* Using a library like Lodash's `merge` function.
* Implementing a custom merge function using recursion or iteration.
* Using a template literal with the `Object.assign()` method.

However, these alternatives may come with their own trade-offs in terms of performance, readability, and maintainability.

Related benchmarks:

Object.assign vs spread -- updated (version: 0)

Comparing performance of: Object.assign vs Spread operator

Created: 4 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):