Benchmark: Spread vs Object.assign Edu Test

Script Preparation code:

var object1 = {
    name: 'John',
    age: 30,
    city: 'New York'
};
var object2 = {
    title: 'The Catcher in the Rye',
    author: 'J.D. Salinger',
    year: 1951
};
var object3 = {
    make: 'Toyota',
    model: 'Corolla',
    year: 2022,
    color: 'silver'
};
var object4 = {
    country: 'France',
    capital: 'Paris',
    population: 67000000
};
var object5 = {
    firstName: 'Emily',
    lastName: 'Smith',
    age: 25,
    occupation: 'Engineer',
    city: 'San Francisco'
};
var object6 = {
    brand: 'Nike',
    product: 'Running Shoes',
    size: 10
};
var object7 = {
    vegetable: 'Broccoli',
    type: 'Green',
    origin: 'California'
};
var object8 = {
    director: 'Christopher Nolan',
    movie: 'Inception',
    year: 2010
};
var object9 = {
    breed: 'Labrador',
    color: 'Golden',
    age: 3
};
var object10 = {
    artist: 'Vincent van Gogh',
    painting: 'Starry Night',
    year: 1889
};
var object11 = {
    continent: 'Asia',
    country: 'China',
    population: 1400000000
};
var object12 = {
    language: 'Spanish',
    country: 'Spain',
    population: 47000000
};
var object13 = {
    artist: 'Leonardo da Vinci',
    painting: 'Mona Lisa',
    year: 1503
};
var object14 = {
    fruit: 'Grapes',
    color: 'Purple',
    origin: 'California'
};
var object15 = {
    brand: 'Adidas',
    product: 'Sneakers',
    size: 9,
    color: 'black'
};
var object16 = {
    actor: 'Tom Hanks',
    movie: 'Forrest Gump',
    year: 1994
};
var object17 = {
    flower: 'Rose',
    color: 'Red',
    origin: 'Netherlands'
};
var object18 = {
    university: 'Harvard',
    location: 'Massachusetts',
    founded: 1636
};
var object19 = {
    car: 'BMW',
    model: 'X5',
    year: 2023,
    color: 'white'
};
var object20 = {
    country: 'Italy',
    capital: 'Rome',
    population: 60000000
};

Tests:

using spread
var result = { ...object1, ...object2, ...object3, ...object4, ...object5, ...object6, ...object7, ...object8, ...object9, ...object10, ...object11, ...object12, ...object13, ...object14, ...object15, ...object16, ...object17, ...object18, ...object19, ...object20 };
using assign
var result = Object.assign({}, object1, object2, object3, object4, object5, object6, object7, object8, object9, object10, object11, object12, object13, object14, object15, object16, object17, object18, object19, object20);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
using spread
using 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):

LLMs can make mistakes. Check important info.

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

**What is being tested?**

The benchmark tests two ways to merge multiple objects into one: using the spread operator (`...`) and `Object.assign()`. The test creates 20 objects with varying properties, then merges them using each method to form a single object. The goal is to determine which method performs better in terms of speed.

**Options compared**

The benchmark compares two options:

1. **Using the spread operator (`...`)**: This method uses the spread operator to merge multiple objects into one. The syntax `var result = { ...object1, ...object2, ...object3, ...}` creates a new object with the properties from each input object.
2. **Using `Object.assign()`**: This method uses the `Object.assign()` function to merge multiple objects into one. The syntax `var result = Object.assign({}, object1, object2, object3, ...)` creates a new object and assigns the properties from each input object to it.

**Pros and cons of each approach**

* **Using the spread operator (`...`)**:
	+ Pros: concise syntax, easy to read and write.
	+ Cons: can be slower than `Object.assign()` for large numbers of objects, as it creates a new object with all properties from each input object.
* **Using `Object.assign()`**:
	+ Pros: faster than the spread operator for large numbers of objects, as it only copies existing properties and avoids creating a new object with all properties from each input object.
	+ Cons: less concise syntax, can be harder to read and write.

**Library used**

The benchmark uses the `Object.assign()` function, which is part of the JavaScript standard library. The spread operator (`...`) is also part of the JavaScript standard library, but it's a more recent addition (introduced in ECMAScript 2018).

**Special JS feature or syntax**

There are no special JS features or syntax used in this benchmark. It only relies on standard JavaScript functions and objects.

**Other alternatives**

If you're interested in exploring alternative approaches to merging multiple objects, here are a few options:

* **Using the `reduce()` method**: You can use the `reduce()` method to merge multiple objects into one. The syntax would be something like `var result = object1.reduce((acc, obj) => ({ ...acc, ...obj }), {})`.
* **Using a library like Lodash**: If you're working with a large number of objects and need to perform complex merging operations, you might consider using a library like Lodash, which provides a `merge()` function that can handle many edge cases.
* **Writing a custom merge function**: Depending on your specific use case, you might want to write a custom merge function that's optimized for performance or readability. This would require writing a function from scratch, but could provide more control over the merging process.

Overall, the benchmark provides a good example of how to compare two different approaches to merging multiple objects in JavaScript.

Related benchmarks:

Spread vs Object.assign Edu Test (version: 0)

Comparing performance of: using spread vs using assign

Created: 2 years ago by: Guest

Jump to the latest result

using spread

using 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):