The Uint8Array array represents an array of 8-bit unsigned integers. By default, the contents of Uint8Array are initialized to 0. The Uint8Array.from() method is used to create a new Uint8Array from an array-like or iterable object. So when you want to convert an arrayLike or iterable object then you can be used this function by passing the object as a parameter to this function along with the map function and value used for the map function if needed.
Syntax:
Uint8Array.from( source, mapFn, thisArg )
Parameters:
This method accepts three parameters as mentioned above and described below:
- source: This parameter contains an array-like or iterable object which is used to convert to a Uint8Array object.
- mapFn: It is an optional parameter which is the Map function to call on every element of the Uint8Array array.
- thisArg: It is an optional parameter that stores the value to use as this when executing mapFn.
Return Value:
This method returns a new Uint8Array instance.
Below example illustrate the working of Uint8Array.from() method in JavaScript:
Example 1: In this example, we will see the basic functionality of the Uint8Array array to create new Uint8array from a string of integers.
javascript
// Create a Uint8Array from a // string like structurelet array = Uint8Array.from('45465768654323456');// Display the resultconsole.log(array); |
Uint8Array(17) [ 4, 5, 4, 6, 5, 7, 6, 8, 6, 5, 4, 3, 2, 3, 4, 5, 6 ]
Example 2: In this example, we will see the basic functionality of the Uint8Array array to create a new Unit8array performing the required transformations.
javascript
// Create a Uint8Array from a array by adding// 3 to each number using functionlet array = Uint8Array.from( [1, 2, 3, 4, 5, 6], (z) => z + 3);// Display the resultconsole.log(array); |
Uint8Array(6) [ 4, 5, 6, 7, 8, 9 ]
