<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
const limit = 10000000;
var array = [];
for (let i = 0; i < limit; i++) {
array.push(i);
}
function getRandomIndex() {
return Math.floor(Math.random() * array.length)
}
var element = array[getRandomIndex()];
array.filter(x => x !== element);
_.remove(array, x => x === element);
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
Native | |
Lodash |
Test name | Executions per second |
---|---|
Native | 1.3 Ops/sec |
Lodash | 1.7 Ops/sec |
I'd be happy to help explain the benchmark and its various components.
Benchmark Definition and Script Preparation Code
The provided JSON represents a JavaScript microbenchmark that compares two approaches for filtering an array: a native JavaScript implementation and a Lodash function. The script preparation code is:
const limit = 10000000;
var array = [];
for (let i = 0; i < limit; i++) {
array.push(i);
}
function getRandomIndex() {
return Math.floor(Math.random() * array.length)
}
var element = array[getRandomIndex()];
This code creates a large array with 10 million elements, generates a random index to access an element in the array, and stores this value in the element
variable. This is done to provide a consistent input for both benchmarking approaches.
Html Preparation Code
The HTML preparation code includes a script tag that loads the Lodash library:
<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
This library provides various utility functions, including those used in the benchmark.
Individual Test Cases
There are two test cases defined in the JSON:
filter()
method to remove elements from the array that do not match the element
value.array.filter(x => x !== element);
_remove()
function to remove elements from the array that match the element
value:_.remove(array, x => x === element);
Options Compared
The two test cases compare the performance of:
filter()
)_remove()
)Pros and Cons of Different Approaches
remove()
function, reducing the need for manual optimization.Library: Lodash
Lodash is a popular JavaScript utility library that provides a collection of functions for various tasks, such as array manipulation (filter()
, _remove()
), string manipulation (str.toUpperCase()
), etc. The library aims to provide a convenient and efficient way to perform common tasks without having to write custom code.
Special JS Feature or Syntax
There is no specific JavaScript feature or syntax used in this benchmark that requires special explanation.
Other Considerations
When running benchmarks, it's essential to consider factors such as:
Other Alternatives
If you were to rewrite this benchmark using alternative approaches, consider:
Array.prototype.filter()
from ES6)Keep in mind that each alternative may have its own trade-offs and considerations.