Benchmark: spread vs Object.assign2

Tests:

spread
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = { ...firstObject, ...secondObject };
assign
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = Object.assign({},firstObject, secondObject);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
spread
assign

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 break down the benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark compares two approaches for merging objects in JavaScript: using the spread operator (`...`) and `Object.assign()`. The goal is to determine which approach is faster.

**Options Compared**

There are two options compared:

1. **Spread Operator (`...`)**: This approach uses the spread operator to merge two objects into a new object. For example:
```javascript
const firstObject = { sampleData: 'Hello world' };
const secondObject = { moreData: 'foo bar' };
const finalObject = { ...firstObject, ...secondObject };
```
2. **`Object.assign()`**: This approach uses the `Object.assign()` method to merge two objects into a new object. For example:
```javascript
const firstObject = { sampleData: 'Hello world' };
const secondObject = { moreData: 'foo bar' };
const finalObject = Object.assign({}, firstObject, secondObject);
```
**Pros and Cons**

Both approaches have their pros and cons:

* **Spread Operator (`...`)**:
	+ Pros: More concise and readable, eliminates the need for explicit `undefined` keys.
	+ Cons: May be slower due to the need to create a new object and iterate over properties.
* **`Object.assign()`**:
	+ Pros: Faster and more efficient, as it uses a native method optimized for performance.
	+ Cons: Requires creating an intermediate object with default values for keys.

**Other Considerations**

In addition to performance, other factors to consider:

* Readability and maintainability of the code. The spread operator can make the code more concise, while `Object.assign()` can lead to more verbose code.
* Support for older browsers or versions of JavaScript. The spread operator was introduced in ECMAScript 2018, so it may not be supported in all environments.

**Library Usage**

There is no explicit library usage mentioned in this benchmark. However, the benchmark relies on the `Object` property, which is a built-in object in JavaScript.

**Special JS Features or Syntax**

This benchmark does not use any special JavaScript features or syntax beyond what's native to the language.

**Alternative Approaches**

Other approaches for merging objects include:

* Using the `merge()` method from the `lodash` library: `const _ = require('lodash'); const finalObject = _.merge({}, firstObject, secondObject);`
* Using a custom implementation with a loop or recursion.
* Utilizing the `reduce()` method or other functional programming techniques.

These alternative approaches may offer different trade-offs in terms of performance, readability, and maintainability.

Related benchmarks:

spread vs Object.assign2 (version: 0)

Comparing performance of: spread vs assign

Created: 3 years ago by: Registered User

Jump to the latest result

spread

assign

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):