Add Tuple3 to a mutable Set in Scala

Question

I have already looked at adding tuples to a Set in scala but nothing seems to work in my case

 val mySet = mutable.HashSet[(String, String, String)]
 val myTuple = ("hi", "hello", "there")

mySet ++= myTuple
mySet += myTuple  // Expects String instead of (String, String, String)
mySet :+ myTuple
mySet :: myTuple

Except the second rest of them are compiler errors. How can I add a Tuple to a mutable Set in scala?

score 3 · Accepted Answer · answered Oct 16 '18 at 06:47

3

I recommend using empty to create an empty collection:

val mySet = mutable.HashSet.empty[(String, String, String)]

This avoids the issue that you found, and makes the intent of the expression clear.

answered Oct 16 '18 at 06:47

Tim

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score 2 · Answer 2 · edited Oct 16 '18 at 00:53

2

Adding parens at the end fixed it:

val mySet = mutable.HashSet[(String, String, String)]()
mySet += myTuple

edited Oct 16 '18 at 00:53

erip

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answered Oct 16 '18 at 00:45

yalkris

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Add Tuple3 to a mutable Set in Scala

2 Answers2