var randomArray = Array.from({ length: 1000 }, () => Math.floor(Math.random() * 256))
new Uint8Array(randomArray)
Uint8Array.from(randomArray)
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
Test new Uint8Array() | |
Test Uint8Array.from() |
Test name | Executions per second |
---|---|
Test new Uint8Array() | 1787336.9 Ops/sec |
Test Uint8Array.from() | 1663558.9 Ops/sec |
Let's dive into the explanation of the provided benchmark.
What is being tested?
The benchmark measures the performance difference between creating a Uint8Array
using two different methods:
new Uint8Array()
: This method creates a new Uint8Array
object from an empty array.Uint8Array.from()
: This method creates a new Uint8Array
object from an existing array.Options compared
The benchmark compares the performance of these two methods on a randomly generated array of 1000 elements, where each element is a random integer between 0 and 255 (inclusive). The goal is to determine which method is faster for creating large arrays.
Pros and Cons of each approach:
new Uint8Array()
: This method creates an empty Uint8Array
object and then populates it with the elements from the random array. This approach can be beneficial if you need to create a Uint8Array
object without any pre-existing data, but it may incur additional overhead due to the repeated allocation of memory.Uint8Array.from()
: This method creates a new Uint8Array
object and populates it with the elements from the random array in a single operation. This approach is generally faster because it avoids the need for repeated allocation of memory.Library used
In this benchmark, the Uint8Array
class is not specifically tied to any library or framework. It is a built-in JavaScript class that is part of the ECMAScript standard.
Special JS feature or syntax
There are no specific special features or syntax mentioned in the benchmark. However, it's worth noting that the use of new Uint8Array()
and Uint8Array.from()
relies on JavaScript's array creation methods, which are supported by most modern browsers.
Other alternatives
If you need to create a large array quickly, there are other approaches you could consider:
Array.prototype.fill()
method: This method can be used to populate an existing array with values, but it requires that the array is already populated.Array.prototype.set()
method: This method can be used to set the values of a large array in place, but it also requires that the array is already populated.Uint8Array
class.Keep in mind that these alternatives may have different trade-offs and use cases compared to the original benchmark.