How to read typed array with another arrays type

Question

I am inside a function, array1 and array2 are it's paramentrs which are typed arrays, any of these: Uint32ArrayorInt32ArrayorFloat64ArrayorUint8Array
Inside this function how can I convert array1 raw data into a typed array equal to array2 type
something like this:

function readArray(array1, array2)
{
    var a = new array2Type(array1.buffer);
    //rest of the code where "a" is used
} 

array2Type is not a valid code, what would be the correct way to do the conversion?

Answer 1

You can create a new typed array view based on a source one doing this:

var dstArray = new window[srcArray.constructor.name](srcArray.buffer);

Implemented in the function:

function readArray(array1, array2) {
  var a = new window[array2.constructor.name](array1.buffer);
  console.log(a.constructor.name);
}

var a1 = new Uint32Array(1);
var a2 = new Float32Array(1);
readArray(a1, a2); //Should log Float32Array

You will however need to add some sanitizing as for example a Uint32Array need four bytes as a minimum, and if you pass in a 1-length Uint16Array it will fail since there are only two bytes. And so forth.