JavaScript | Int16Array from() Method

The Int16Array array represents an array of twos-complement of 16-bit signed integers. By default, the contents of Int16Array are initialized to 0.
from the () function of Int16Array used to creates a new Int16Array from an array-like or iterable object. So when you want to convert an arrayLike or iterable object to Int16Array then you can use 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:

Int16Array.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 Int16Array object.
  2. mapFn: This parameter is Optional which is Map function to call on every element of the Int16Array array.
  3. thisArg: This parameter is Optional which is value to use as this when executing mapFn.

Return Value: this method returns a new Int16Array instance.

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

Program 1:

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<script>
    //create a Int16Array from a string like structure
    var array = Int16Array.from('654456543456');
  
    //print the result
    document.write(array);
</script>

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Output:

6, 5, 4, 4, 5, 6, 5, 4, 3, 4, 5, 6

Program 2:

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<script>
    //create a Int16Array from a array by converting numbers
    //twice the actual number
    var array = Int16Array.from([32, 43, 41, 34], z => z * 2);
  
    //print the result
    document.write(array);
</script>

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Output:

64, 86, 82, 68

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




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