<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.core.js"></script>
function shuffle(array) {
let currentIndex = array.length, randomIndex;
// While there remain elements to shuffle.
while (currentIndex != 0) {
// Pick a remaining element.
randomIndex = Math.floor(Math.random() * currentIndex);
currentIndex--;
// And swap it with the current element.
[array[currentIndex], array[randomIndex]] = [
array[randomIndex], array[currentIndex]];
}
return array;
}
var data = shuffle('The quick brown fox jumps over the lazy dog.'.split(''));
data.find(item => item === 'x');
data.some(item => item === 'x');
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
array find | |
array some |
Test name | Executions per second |
---|---|
array find | 25311274.0 Ops/sec |
array some | 36134340.0 Ops/sec |
Let's break down the provided JSON and explain what's being tested.
Benchmark Overview
The benchmark is comparing two approaches to find an element in an array:
Array.prototype.find()
Array.prototype.some()
The array contains a shuffled version of the string "The quick brown fox jumps over the lazy dog." with each word as an individual element.
Options Compared
Two options are being compared:
Array.find()
: Returns the first element in the array that satisfies the provided condition.Array.some()
: Returns true if at least one element in the array satisfies the provided condition.Pros and Cons of Each Approach
Array.prototype.find()
:Array.prototype.some()
:find()
since it iterates over the entire array.Library Used
The benchmark uses the Lodash library (lodash.core.js
) for its some()
function. Lodash is a popular JavaScript utility library that provides a wide range of functions for working with arrays, objects, and more. In this case, it's used to implement the some()
method.
Special JS Feature or Syntax
This benchmark does not use any special JavaScript features or syntax beyond what's standard in modern JavaScript.
Other Considerations
When writing benchmarks like this one, consider the following:
Alternatives
Other alternatives for implementing Array.prototype.find()
and Array.prototype.some()
include:
For find()
: You can implement a custom function using a loop or recursion. For example:
function find(arr, callback) {
for (let i = 0; i < arr.length; i++) {
if (callback(arr[i])) return arr[i];
}
return undefined;
}
For some()
: You can implement a custom function using a loop and a flag variable. For example:
function some(arr, callback) {
let result = false;
for (let i = 0; i < arr.length; i++) {
if (callback(arr[i])) result = true;
if (result) break;
}
return result;
}
Keep in mind that these implementations may not be as efficient or readable as the standard find()
and some()
methods.