let firstObject = { sampleData: 'Hello world' }
const secondObject = { moreData: 'foo bar' }
firstObject = {
firstObject,
secondObject
};
const firstObject = { sampleData: 'Hello world' }
const secondObject = { moreData: 'foo bar' }
const finalObject = Object.assign(firstObject, secondObject);
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
Spread | |
Object.assign |
Test name | Executions per second |
---|---|
Spread | 18154406.0 Ops/sec |
Object.assign | 3504240.8 Ops/sec |
Let's break down the provided benchmark and explain what is being tested.
Benchmark Overview
The benchmark measures the performance difference between using the spread operator (...
) to update an object versus using Object.assign()
for updating objects in JavaScript.
Options Compared
Two options are compared:
...
): This operator allows you to create a new object by copying properties from an existing object.Pros and Cons
...
):Library and Special JavaScript Features
In this benchmark, there is no explicit library mentioned. However, some general assumptions can be made:
...
spread operator was introduced in ECMAScript 2015 (ES6) and is widely supported across modern browsers.Object.assign()
has been part of the JavaScript standard since ECMAScript 2009.Other Considerations
When deciding between the spread operator and Object.assign()
, consider the following factors:
Object.assign()
might be more suitable.Object.assign()
might provide better results.Other Alternatives
For updating objects in JavaScript, other methods exist:
Keep in mind that the spread operator has become a widely accepted and efficient method for updating objects in modern JavaScript development.