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JavaScript Int32Array.from() Method - GeeksforGeeks

Last Updated : 11 Jul, 2023

The Javascript Int32Array array represents an array of two's-complement 32-bit signed integers in the platform byte order. By default, the contents of Int32Array are initialized with 0. 

The Int32Array.from() method is used to create a new Int32Array from an array-like or iterable object. So when you want to convert an arrayLike or iterable object to Int32Array 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. 

Int32Array.from(source, mapFn, thisArg);

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 into an Int32Array object.
• mapFn: This parameter is an optional parameter which is the Map function to call on every element of the Int32Array array.
• thisArg: This parameter is an optional parameter which is the value to use as this when executing mapFn.

This method returns a new Int32Array instance. 

Below examples Illustrate the working of Int32Array.from() method in JavaScript:

Example 1: In this example, we will see a basic program of the JavaScript Int32Array.from() method to create Int32array from a string of integers.

// Create an Int32Array array from a
// string like structure
let array = Int32Array.from('765432345');

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

Int32Array(9) [
  7, 6, 5, 4, 3,
  2, 3, 4, 5
]

Example 2: In this example, we will see a basic program of the JavaScript Int32Array.from() method to create a new Int32array by performing transformation at each element

// Create an Int32Array array by converting
// numbers 32 times the actual number
let array = Int32Array.from(
    [434, 4323, 43234, 433, 434, 343],
    (z) => z * 32
);

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

Int32Array(6) [ 13888, 138336, 1383488, 13856, 13888, 10976 ]

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