Benchmark: Spread vs Object.assign Test

Tests:

Spread Operator
const firstObj = { sampleData: "test" }; const secondObj = { moreData: "test2" }; const finalObj = { ...firstObj, ...secondObj, };
Object.assign
const firstObj = { sampleData: "test" }; const secondObj = { moreData: "test2" }; const finalObj = Object.assign({}, firstObj, secondObj);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Spread Operator
Object.assign

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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Let's break down the benchmark and its test cases.

**Benchmark Definition**

The provided JSON defines two microbenchmarks: `Spread Operator` and `Object.assign`. The benchmarks compare the performance of these two approaches in creating a new object by merging two existing objects.

**Options Compared**

The two options being compared are:

1. **Spread Operator (`...`)**: This is a shorthand way to create a new object by spreading the properties of an existing object onto a new object.
2. **Object.assign()**: This is a method that merges the properties of one or more source objects into a target object.

**Pros and Cons**

Here's a brief summary of the pros and cons of each approach:

* **Spread Operator (`...`)**:
	+ Pros: concise, easy to read, and maintainable.
	+ Cons: may be slower due to the creation of intermediate objects.
* **Object.assign()**:
	+ Pros: can handle arrays and non-objects as well as objects.
	+ Cons: may have performance issues with large amounts of data or complex object structures.

In general, the spread operator is considered a more modern and readable approach, while Object.assign() has been around for longer and is more widely supported. However, in terms of performance, the spread operator might be slower due to its use of intermediate objects.

**Library**

There are no libraries explicitly mentioned in the benchmark definition. However, it's worth noting that both the spread operator and Object.assign() rely on the JavaScript Engine's implementation, which can vary between browsers and platforms.

**Special JS Features or Syntax**

The benchmark uses a feature called **template literals**, which is a new way of creating strings in JavaScript that allows for easy interpolation and formatting. Template literals are supported by most modern browsers and engines.

**Benchmark Preparation Code**

Since there is no specific preparation code provided, we can assume that the test cases are straightforward and don't require any additional setup beyond what's defined in the benchmark definition itself.

**Other Alternatives**

If you're interested in exploring alternative approaches, here are a few examples:

* **Object.create()**: This method creates a new object with an empty prototype. You can then assign properties to this object using Object.assign().
* **Array.prototype.concat()**: If you need to merge arrays, you can use the concat() method.
* **For loops and object iteration**: You can also write a simple loop to iterate over the properties of an object and assign them to a new object.

Keep in mind that these alternatives might have performance implications or be less readable than the options being compared in this benchmark.

Related benchmarks:

Spread vs Object.assign Test (version: 0)

Comparing performance of: Spread Operator vs Object.assign

Created: 7 years ago by: Guest

Jump to the latest result

Spread Operator

Object.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):