Benchmark: Object.assign vs spread operator s

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 };

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Suite status: <idle, ready to run>

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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):

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I'd be happy to help you understand what's being tested in this benchmark.

**Benchmark Overview**

The benchmark compares the performance of two ways to merge an object with another object: using `Object.assign()` and the spread operator (`...`).

**Test Cases**

There are only two test cases:

1. **Object.assign()**: This test case creates a variable `params` with some initial properties (e.g., `b:"hello"`, `c:true`, `d:7`) and then uses `Object.assign()` to merge another object (`{a:2}`) into `params`. The resulting object is stored in the `other` variable.
2. **Spread Operator**: This test case creates a similar variable `params` with some initial properties, but instead of using `Object.assign()`, it uses the spread operator (`...`) to merge another object (`{a:2}`) into `params`. The resulting object is also stored in the `other` variable.

**Options Compared**

The two options being compared are:

* **Object.assign()**: A method on the `Object` prototype that creates a new object with the properties of an existing object and adds new ones.
* **Spread Operator (`...`)**: A syntax sugar for creating a new object with the same properties as another object.

**Pros and Cons**

**Object.assign():**

Pros:

* Widely supported across browsers and platforms
* Easy to read and understand

Cons:

* Can be slower than the spread operator in modern browsers
* May have performance issues with large objects

**Spread Operator (`...`):**

Pros:

* Generally faster than `Object.assign()` due to its use of a native JavaScript method
* More concise and expressive code

Cons:

* Less widely supported across older browsers and platforms
* Can be less readable for those not familiar with the syntax

**Other Considerations**

* Both methods create a new object, rather than modifying the original objects.
* The spread operator is available in modern browsers, but may not work in older browsers or environments.

**Library/Features Used**

In this benchmark, none of the JavaScript libraries are explicitly mentioned. However, it's worth noting that both `Object.assign()` and the spread operator have been part of the JavaScript language since ECMAScript 2015 (ES6).

**Special JS Feature/Syntax**

The benchmark uses the spread operator (`...`), which is a relatively new feature in JavaScript (introduced in ES6). It provides a concise way to create a new object with the same properties as another object. If you're not familiar with this syntax, it's simply an alternative way to merge objects.

**Other Alternatives**

If you wanted to benchmark other ways of merging objects, some alternatives could be:

* Using `Object.prototype.concat()` (although this is deprecated in modern browsers)
* Using a library like Lodash or Ramda for object manipulation
* Using a template literal with the spread operator (`{...}`)

Keep in mind that each alternative would have its own pros and cons, and might not provide an accurate comparison to the original benchmark.

Related benchmarks:

Object.assign vs spread operator s (version: 0)

Comparing performance of: Object.assign vs spread operator

Created: 6 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):