const firstObject = { sampleData: 'Hello world' }
const secondObject = { moreData: 'foo bar' }
const finalObject = {
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 |
---|---|
Using the spread operator | |
Using Object.assign |
Test name | Executions per second |
---|---|
Using the spread operator | 2473878.2 Ops/sec |
Using Object.assign | 5816587.5 Ops/sec |
Let's break down what's being tested in this JavaScript benchmark.
Benchmark Goal
The goal of this benchmark is to compare the performance of two ways to merge objects in JavaScript:
...
).Object.assign()
.Options Compared
There are only two options being compared: using the spread operator and using Object.assign()
. Both methods are used to create a new object by merging two existing objects.
Pros and Cons of Each Approach
...
):Object.assign()
due to the overhead of parsing the spread operator.Object.assign()
:Other Considerations
Library Used
There is no explicit library mentioned in the benchmark definition or test cases. However, it's worth noting that Object.assign()
is a native JavaScript function, so no external library is needed to use it.
Special JS Feature/Syntax
The benchmark uses the spread operator (...
), which was introduced in ECMAScript 2018 (ES9). The syntax allows for concisely merging objects and arrays.
Alternative Approaches
If you're interested in exploring alternative approaches, here are a few options:
Object.create()
: This method creates a new object by creating an object with the specified prototype.Keep in mind that these alternative approaches might not be as concise or readable as the spread operator or Object.assign()
, but they can provide more control over the merging process.