Benchmark: JavaScript spread operator perfornance comparisons add things

Tests:

Using the spread operator
const firstObject = { sampleData: 'Hello world' } const finalObject = { ...firstObject, ...{ moreData: 'foo bar' } };
Using single item addition.
const firstObject = { sampleData: 'Hello world' } const finalObject = { ...firstObject, moreData: 'foo bar', };
using object assign
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = Object.assign(firstObject, secondObject)
Another Bench with Two obj spread
const firstObject = { sampleData: 'Hello world' } const secondObj = { moreData: 'foo bar' } const finalObject = { ...firstObject, ...secondObj, };

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Using the spread operator
Using single item addition.
using object assign
Another Bench with Two obj spread

Fastest: N/A

Slowest: N/A

Latest run results:

No previous 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 benchmark and its test cases to understand what is being tested.

**Benchmark Context**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The benchmark in question compares different approaches for adding data to an object using the spread operator, single item addition, or the `Object.assign()` method.

**Test Cases**

There are four test cases:

1. **Using the Spread Operator**: This test case uses the spread operator (`...`) to add two objects together. The first object contains a single property called `sampleData` with the value `'Hello world'`. The second object adds another property called `moreData` with the value `'foo bar'`.
2. **Using Single Item Addition**: In this test case, each item is added individually using the spread operator (`...`) to add two objects together. The first object contains a single property called `sampleData` with the value `'Hello world'`. The second object contains only one property called `moreData` with the value `'foo bar'`.
3. **Using Object Assign**: This test case uses the `Object.assign()` method to merge two objects together. The first object contains a single property called `sampleData` with the value `'Hello world'`. The second object adds another property called `moreData` with the value `'foo bar'`.
4. **Another Bench with Two Obj Spread**: This test case is similar to the first one, but it adds two objects together using the spread operator (`...`). However, instead of having a single property in the second object, it contains multiple properties.

**Library Used**

The `Object.assign()` method uses the JavaScript built-in `Object.assign()` function, which is a part of the ECMAScript standard. This function takes an arbitrary number of source objects and merges them into a target object.

**JavaScript Features/ Syntax**

* The spread operator (`...`) is used in all test cases to add data to an object.
* Single item addition is used in the second test case, where each property is added individually using `...`.

**Options Compared**

The benchmark compares four different approaches:

1. Using the spread operator (`...`)
2. Using single item addition
3. Using the `Object.assign()` method

**Pros and Cons of Each Approach**

* **Using the Spread Operator` (`...`)**
	+ Pros:
		- More concise and readable syntax.
		- Can handle nested objects.
	+ Cons:
		- May be slower than other approaches due to the overhead of creating a new array.
* **Using Single Item Addition**
	+ Pros:
		- Less verbose syntax compared to using `...`.
	+ Cons:
		- Less readable and less suitable for handling complex data structures.
* **Using Object Assign()**
	+ Pros:
		- More efficient than using the spread operator for simple object merges.
	+ Cons:
		- May be less readable due to the use of `Object.assign()`.

**Other Considerations**

The benchmark does not consider factors like performance in different browsers or versions, or the impact of other JavaScript features on the execution time. It only focuses on the specific syntax and approaches being compared.

**Alternatives**

If you're looking for alternative approaches, here are a few:

* Using destructuring assignment (`{ ...firstObject }`) to merge objects.
* Using the `reduce()` method with an accumulator function to merge objects.
* Using a custom implementation of object merging using loops or recursion.

Related benchmarks:

JavaScript spread operator perfornance comparisons add things (version: 0)

Comparing performance of: Using the spread operator vs Using single item addition. vs using object assign vs Another Bench with Two obj spread

Created: 5 years ago by: Guest

Jump to the latest result

Using the spread operator

Using single item addition.

using object assign

Another Bench with Two obj spread

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):