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With Scala, what is the best way to read from an InputStream to a bytearray?
I can see that you can convert an InputStream to char array
Source.fromInputStream(is).toArray() 
847
Create a ByteArrayInputStream ByteArrayInputStream package first. Once we import the package, here is how we can create an input stream. // Creates a ByteArrayInputStream that reads entire array ByteArrayInputStream input = new ByteArrayInputStream(byte[] arr);
read(byte[] b) method reads b. length number of bytes from the input stream to the buffer array b. The bytes read is returned as integer.
How about:
Stream.continually(is.read).takeWhile(_ != -1).map(_.toByte).toArray Update: use LazyList instead of Stream (since Stream is deprecated in Scala 3)
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