<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
let detailsCon = {
images: [{
imageUrl: 'Test'
}]
};
let detailsCon = {
images: [{
imageUrl: 'Test'
}]
};
let ldValue = _.get(detailsCon, 'images[0].imageUrl', '')
let detailsCon = {
images: [{
imageUrl: 'Test'
}]
};
let imgSrc = detailsCon && detailsCon.images && detailsCon.images[0] && detailsCon.images[0].imageUrl ?
detailsCon.images[0].imageUrl : '';
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
Lodash | |
Javascript |
Test name | Executions per second |
---|---|
Lodash | 1143647.0 Ops/sec |
Javascript | 114911544.0 Ops/sec |
I'll break down the provided benchmark definition, test cases, and latest benchmark results to explain what's being tested and the pros and cons of different approaches.
Benchmark Definition
The benchmark is comparing two approaches to access nested properties in an object:
_.get()
method from the Lodash library.?.
).Script Preparation Code and Html Preparation Code
The script preparation code defines a JavaScript object detailsCon
with nested properties:
let detailsCon = {
images: [
{ imageUrl: 'Test' }
]
};
The html preparation code includes the Lodash library in the HTML file.
Individual Test Cases
There are two test cases:
let ldValue = _.get(detailsCon, 'images[0].imageUrl', '');
This code uses _.get()
to access the imageUrl
property of the first element in the images
array, or an empty string if the property doesn't exist.
let imgSrc = detailsCon && detailsCon.images && detailsCon.images[0] && detailsCon.images[0].imageUrl ?
detailsCon.images[0].imageUrl : '';
This code uses optional chaining (?.
) to access the imageUrl
property of the first element in the images
array, or an empty string if any part of the chain is null or undefined.
Pros and Cons
.get()
method):?.
):Library: Lodash
Lodash is a popular JavaScript utility library that provides a set of functional programming helpers, including the _.get()
method. It's widely used for its concise and expressive way to perform common tasks like data manipulation, iteration, and function composition.
Special JS Feature: Optional Chaining (?.
)
Optional chaining is a relatively recent addition to the JavaScript language (introduced in ECMAScript 2020). It allows you to access nested properties or call methods on objects with optional chaining, preventing null pointer exceptions. The syntax obj.property?.childProperty
returns the value of childProperty
if it exists; otherwise, it returns undefined.
Other Alternatives
If you don't want to use Lodash or prefer a more native JavaScript approach, you could consider using other alternatives like:
in
operator for property access (e.g., detailsCon.images[0].imageUrl
)hasOwnProperty()
method on objects (e.g., detailsCon.hasOwnProperty('images[0].imageUrl')
)Keep in mind that each alternative has its own trade-offs and may not offer the same level of conciseness or expressiveness as Lodash's .get()
method.