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I've found many ways to create a Float32Array from an array, but all of them involve copying all elements. I want to avoid that cost, because the array will never be used again. I just want to cast it. How is that possible?
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The Float32Array typed array represents an array of 32-bit floating point numbers (corresponding to the C float data type) in the platform byte order. If control over byte order is needed, use DataView instead. The contents are initialized to 0 .
The ArrayBuffer object is used to represent a generic, fixed-length raw binary data buffer. It is an array of bytes, often referred to in other languages as a "byte array".
JavaScript typed arrays are array-like objects that provide a mechanism for reading and writing raw binary data in memory buffers. Array objects grow and shrink dynamically and can have any JavaScript value. JavaScript engines perform optimizations so that these arrays are fast.
It's impossible. A Float32Array is always a different object than a normal array.
If you want to avoid the cost of copying the items, a) don't use a normal array in the first place or b) let your function that uses it work with normal arrays as well.
If you are looking for the "casting" operation, you can just invoke the Float32Array constructor with the normal array:
var arr = [0.3, 1, 2];
var typedArr = new Float32Array(arr);
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