const numArray = [1,2,3,4,5,6,7,8,9]
numArray.slice(1)
const numArray = [1,2,3,4,5,6,7,8,9]
const [,newNumArray]= numArray;
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
slice | |
spread |
Test name | Executions per second |
---|---|
slice | 42619216.0 Ops/sec |
spread | 44165596.0 Ops/sec |
I'll break down the explanation into sections to make it easier to understand.
What is tested on the provided JSON?
The provided JSON represents two individual test cases for measuring the performance of JavaScript microbenchmarks on MeasureThat.net. Each test case has a unique "Benchmark Definition" that defines the code snippet to be executed.
In this specific case, there are only two test cases:
slice
: This benchmark definition uses the slice()
method to create a new array containing all elements except the first one.spread
: This benchmark definition uses the spread operator (...
) to create a new array from the original array.Options compared
The options being compared in this test case are:
slice()
: A built-in JavaScript method that returns a shallow copy of a portion of an array....
: The spread operator, which creates a new array by spreading the elements of an existing array.Pros and Cons
Here's a brief overview of each option:
slice()
:...
(spread operator):slice()
.Library usage
None of the provided benchmark definitions rely on any external libraries.
Special JS feature or syntax
There are no special JavaScript features or syntax mentioned in these benchmark definitions. The code snippets only use built-in methods and operators.
Other alternatives
If you wanted to compare other options, here are some alternative approaches:
filter()
: Instead of using slice()
or the spread operator, you could use the filter()
method to create a new array with only the desired elements.map()
: Similar to filter()
, but would be used when you need to transform each element in the array before creating a new one.for
or while
) to iterate over the array and create a new one, but this would likely be slower than using built-in methods like slice()
or the spread operator.Overall, these benchmark definitions are designed to test the performance of JavaScript arrays using two common methods: slice()
and the spread operator.