The Javascript Uint16Array represents an array of 16-bit unsigned integers in the platform byte order. By default, the contents of Uint16Array are initialized to 0. The Uint16Array.from() function is used to create a new Uint16Array from an array-like or iterable object. So when you want to convert an arrayLike or iterable object then you can use 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:

Uint16Array.from( source, mapFn, thisArg )

Parameters: This method accepts three parameters as mentioned above and described below.

• source: This parameter is an array-like or iterable object which is used to convert to an Uint16Array object.
• mapFn: This parameter is optional which is the Map function to call on every element of the Uint16Array .
• thisArg: This parameter is optional which is a value to use as this when executing mapFn.

Return Value: This method returns a new Uint16Array instance. 

The below examples illustrate the Unit16Array.from() Method in JavaScript: 

Example 1: This example shows the basic working of the Unit16Array.from() Method in JavaScript.

// Create a Uint16Array from a string
// like structure
let array = Uint16Array.from('543234543');

// Print the result
console.log(array);

Output:

5, 4, 3, 2, 3, 4, 5, 4, 3

Example 2: This example shows the basic working of the Unit16Array.from() Method in JavaScript.

// Create a Uint16Array from a array
// multiplying 3 to each number
// using function
let array = Uint16Array.from([32,
    53, 122, 434, 213], z => z * 3);

// Print the result
console.log(array);

Output:

96, 159, 366, 1302, 639