JavaScript Uint32Array from() Method

The Javascript Uint32Array array represents an array of 32-bit unsigned integers in the platform byte order. By default, the contents of Uint32Array are initialized to 0. 

The from() function of Uint32Array is used to create a new Uint32Array 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: 

Uint32Array.from(source, mapFn, thisArg)

Parameters:

This method accepts three parameters that are specified below: 

• source: This parameter is an array-like or iterable object which is used to convert to a Uint32Array object.
• mapFn: This parameter is Optional which is a Map function to call on every element of the Uint32Array array.
• thisArg: This parameter is Optional which is a value to use as this when executing mapFn.

Return Value:

This method returns a new Uint32Array instance.

JavaScript program to Illustrate the working of from() function: 

Example 1: In this example, we will see the basic use of the JavaScript Uint32Array.from() method to display the creation of Uint32Array form a string of numbers.

javascript

// Create a Uint32Array from
// a string like structure
let array = Uint32Array.from('987654321234567');

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

Output

Uint32Array(15) [
  9, 8, 7, 6, 5, 4,
  3, 2, 1, 2, 3, 4,
  5, 6, 7
]

Example 2: In this example, we will see the basic use of JavaScript Uint32Array.from() method to implement the transformation on every element to create a new Uint32Array instance.

javascript

// Create a Uint32Array from a array by
// dividing by 32 to each number using function
let array = Uint32Array.from(
    [
        543234, 432345, 5432123, 43234,
        23432, 5432345, 432345, 23432,
    ],
    (z) => z / 32
);

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

Output

Uint32Array(8) [
   16976,  13510,
  169753,   1351,
     732, 169760,
   13510,    732
]