Scala collection Set is not adding Elem as expected

[Nishan Patel]

Hi All,

I'm using Scala 2.11.7 with JDK 1.8 and from the REPL when I'm trying to created mutable and immutable set with 5-6 element, when I was getting result it is automatically giving element in wrong order.

Please see below image for more details. 

For mutable Set: When I was adding 1 to 6 it gives set as res0: Set(1,5,2,6,3,4) instead of Set(1,2,3,4,5,6)

Same as for immutable Set: When I was adding 1 to 6. it gives res1: Set(5,1,6,2,3,4)

Both mutable and immutable set is working and giving correct order until I add element upto 4. When I add 5th elem it gives returning set in wrong order.

Looks like it is a bug in collection, if not please let me know why it is behaving like  this.

Thanks,

Nishan Patel

[Sébastien Doeraene]

Hello,

It is not a bug. Sets, as well as Maps, are unordered collections. The order of their elements is not guaranteed. If you need a set that preserves insertion order, there is LinkedHashSet:
http://www.scala-lang.org/api/2.11.8/index.html#scala.collection.mutable.LinkedHashSet

Cheers,

Sébastien

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[Nishan Patel]

Thanks I got it. 

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