<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
var arr = ['a', 'b', 'c'];
var a = _.isEmpty(arr)
var a = arr?.lenght === 0
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
_.isEmpty | |
lenght |
Test name | Executions per second |
---|---|
_.isEmpty | 5390194.5 Ops/sec |
lenght | 22216416.0 Ops/sec |
Let's break down the provided JSON benchmark and explain what's being tested.
What is being tested?
The provided JSON benchmark tests two different ways to check if an array is empty using JavaScript.
_.isEmpty(arr)
method returns true
when called with an array arr
.??
) and the length property of arrays.Options compared:
The two options being compared are:
_.isEmpty(arr)
method??
) with array length comparison (arr?.length === 0
)Pros and Cons:
Lodash's _.isEmpty(arr)
method:
Pros:
Cons:
Nullish Coalescing Operator (??
) with array length comparison:
Pros:
Cons:
Other considerations:
When choosing between these two options, consider factors like code readability, performance, and maintenance. If you're writing new code and want to use a modern syntax, the nullish coalescing operator with array length comparison might be a better choice. However, if you need to support older browsers or environments that don't support this syntax, Lodash's _.isEmpty(arr)
method might be a safer option.
Library description:
Lodash is a utility library for functional programming in JavaScript. It provides an extensive set of functions and methods for tasks like array manipulation, string manipulation, and more. The _.isEmpty()
function is specifically designed to check if an object (including arrays) is empty or has no properties.
Special JS feature or syntax:
The nullish coalescing operator (??
) was introduced in ECMAScript 2020 (ES2020). It allows you to provide a default value for a variable that might be null
or undefined
. In the context of this benchmark, it's used with array length comparison to create a concise and readable way to check if an array is empty.
Alternatives:
Other alternatives to Lodash's _.isEmpty(arr)
method include:
undefined
.Array.isEmpty()
or is-empty()
, which provides similar functionality.Keep in mind that these alternatives might require more code and may not be as concise or readable as Lodash's _.isEmpty(arr)
method.