How do I do a deep copy of a 2D array in Scala?
For example
val a = Array[Array[Int]](2,3)
a(1,0) = 12
I want val b to copy values of a but without pointing to the same array.
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Discussion of a similar topic can be found at: <stackoverflow.com/questions/1267436/…>Derek Mortimer– Derek Mortimer2009-12-09 00:00:45 +00:00Commented Dec 9, 2009 at 0:00
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This is not valid code in your example. Can you reformat?Mitch Blevins– Mitch Blevins2009-12-09 01:20:00 +00:00Commented Dec 9, 2009 at 1:20
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3 Answers
Just transpose it twice
a.transpose.transpose
Comments
Given:
val a = Array[Array[Int]]
you could try:
for(inner <- a) yield {
for (elem <- inner) yield {
elem
}
}
A deeper question is WHY you would want do do so with ints? The whole point of using immutable types is to avoid exactly this kind of construct.
If you have a more generic Array[Array[T]], then your main concern is how to clone the instance of T, not how to deep-clone the array.
1 Comment
Randall Schulz
Arrays in Scala are Java arrays and hence mutable.