<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.core.js"></script>
var a = ['hello', 'a', 'bc','d','e','f','sdf'];
var result = false;
a.forEach(i=>{
if(i==='bc') {
result = true;
}
});
var a = ['hello', 'a', 'bc','d','e','f','sdf'];
var b = a.some(item => item === 'bc');
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
foreach | |
some |
Test name | Executions per second |
---|---|
foreach | 34981272.0 Ops/sec |
some | 83838920.0 Ops/sec |
Let's break down the provided JSON data and explain what's being tested in each benchmark.
Overview
MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The goal of these benchmarks is to compare the performance of different approaches to achieve a specific result.
Benchmark Definition
The benchmark definition provides a brief description of the test, which in this case is comparing two methods: forEach
and some
. The script preparation code is empty, indicating that no additional setup or dependencies are required for the tests. However, it's worth noting that the benchmark uses Lodash.js library, which is imported via an HTML script tag.
Individual Test Cases
There are only two test cases:
a
with six elements and iterates over it using the forEach
method. The callback function checks if the current element is 'bc'
, and if so, sets a variable result
to true
. The test measures how long it takes for this loop to execute.a
as above but uses the some
method instead of forEach
. The callback function checks if the current element is 'bc'
, and if so, returns a boolean value indicating whether the loop should continue.Library: Lodash.js
Lodash.js is a popular utility library for JavaScript that provides a collection of functional programming helpers. In this benchmark, Lodash.js is used to provide a default value for the result
variable in both test cases.
Pros and Cons:
result
.Special JS Feature/Syntax
There's no special JavaScript feature or syntax being tested in these benchmarks. The code is standard JavaScript, with no experimental features like async/await
or ES modules.
Other Alternatives
If you wanted to run a similar benchmark, you could consider alternative approaches:
forEach
and some
methods in vanilla JavaScript.for
or while
loop instead of relying on the forEach
and some
methods.Keep in mind that these alternatives would require significant changes to the benchmark code and setup.