JavaScript Float32Array.from() Method

The Javascript Float32Array array represents an array of 32-bit floating-point numbers in the platform byte order. By default, the contents of Float32Array are initialized to 0. The Float32Array.from() method is used to create a new Float32Array from an array-like or iterable object. So when you want to convert an arrayLike or iterable object to Float32Array 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:

Float32Array.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 a Float32Array object.
• mapFn: This parameter is optional which is the Map function to call on every element of the Float32Array array.
• thisArg: This parameter is optional which is a value to use as this when executing mapFn.

Return Value: This method returns a new Float32Array instance. 

The below examples illustrate the Float32Array.from() Method in JavaScript: 

Example 1: This example shows the basic use of the Float32Array.from() Method in JavaScript.

// Create a Float32Array from a string like structure
let array = Float32Array.from('7654312456754');

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

Output:

7, 6, 5, 4, 3, 1, 2, 4, 5, 6, 7, 5, 4

Example 2: This example shows the basic use of the Float32Array.from() Method in JavaScript.

// Create a Float32Array from an array by
// multiplying 33.32 to each number using
// function
let array = Float32Array.from([5232.4242,
    3114.24551], z => z * 33.32);

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

Output:

174344.375, 103766.6640625