Kotlin toArray vs asArray

Question

Just wondering, what's the difference between to- and as- prefixes the Kotlin libraries?

var buffer:ByteArray
// what's the difference between these two
buffer.toUByteArray()
buffer.asUByteArray()

I would imagine one refers to a copy of the array, and the other is more of a wrapper pointing to the same values in memory, but I'm not sure.

Jorge Luiz · Accepted Answer · 2020-09-24 21:39:15Z

2

toUByteArray: Returns an array of type UByteArray, which is a copy of this array where each element is an unsigned reinterpretation of the corresponding element of this array.

asUByteArray: Returns an array of type UByteArray, which is a view of this array where each element is an unsigned reinterpretation of the corresponding element of this array.

Explanation about difference between in copy and view:

While executing the functions, some of them return a copy of the input array, while some return the view. When the contents are physically stored in another location, it is called Copy. If on the other hand, a different view of the same memory content is provided, we call it as View

References:

toUByteArray

asUByteArray

NumPy - Copies & Views

edited Sep 24, 2020 at 21:39

answered Sep 24, 2020 at 21:10

Jorge Luiz

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