JavaScript | Uint32Array from() Method

The 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.

from() function of Uint32Array used to creates 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 map function and value used for map function if needed.

Synatx:

Uint32Array.from(source[, mapFn[, thisArg]])

parameters: This method accepts three parameters that are specified below:

  1. source: This parameter is an array-like or iterable object which is used to convert to a Uint32Array object.
  2. mapFn: This parameter is Optional which is Map function to call on every element of the Uint32Array array.
  3. thisArg: This parameter is Optional which is 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:
Program 1:

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<script>
    //create a Uint32Array from a string like structure
    var array = Uint32Array.from('987654321234567');
  
    //print the result
    document.write(array);
</script>

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Output:

9, 8, 7, 6, 5, 4, 3, 2, 1, 2, 3, 4, 5, 6, 7

Program 2:

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<script>
    //create a Uint32Array from a array by 
    //dividing by 32 to each number using function
    var array = Uint32Array.from([543234, 432345, 5432123, 43234,
        23432, 5432345, 432345, 23432
    ], z => z / 32);
  
    //print the result
    document.write(array);
</script>

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Output:

16976, 13510, 169753, 1351, 732, 169760, 13510, 732

References:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/TypedArray/from#

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