How to convert Uint8Array to a float in javascript?

Question

I have an ArrayBuffer that I convert to a Uint8Array so that I can use traditional array access with square brackets and gather a subarray. Now that I have the correct set of 4 bytes that describe the 32-bit (little endian) floating point number, I don't seem to have an easy way to convert to the floating point value:

var startIndex = 2;
var buffer = new Uint8Array(data)
buffer.subarray(startIndex, startIndex + 4);
var myNumber = ?uint8ArrayToFloat(buffer);
console.log(myNumber);

I'm new to JavaScript and am still looking around different docs...

Alexander Gessler · Accepted Answer · 2014-10-03 22:46:46Z

5

You can use DataView.getFloat32. First, you would create the DataView from the original ArrayBuffer (or the Uint8Array). getFloat32 takes an optional parameter that allows you to specify the endianess of the data you are reading.

edited Oct 3, 2014 at 22:46

answered Oct 3, 2014 at 22:41

Alexander Gessler

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2 Comments

tarabyte Over a year ago

how can you create a DataView from a Uint8Array? I'm getting the error that my first argument to the DataView constructor must be an ArrayBuffer

tarabyte Over a year ago

ah, you have to realize when you're going against the flow sometimes. refactored everything to pass around array buffers instead.

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