ToString Method: is used to convert the tuple to String. We can also use _1, _2, _3, _4 to print the tuple value. If we want to print the particular element in the tuple then we need to use productelement.įor example if i want to print the 4 element then i need to use use productElement(3) scala> fruitsTuple_4.productElement(3) scala> fruitsTuple_4.productIterator.foreach(println) We have to use productIterator on tuple to iterate through tuple elements and then we also need to use foreach to iterate through the productIterator which contains tuple elements.
SCALA TUPLE HOW TO
How to iterate through Scala Tuple elements? Res14: Class[_ val fruitsTuple_2 = ("Orange", 30)įruitsTuple_2: (String, Int) = (Orange,30) scala> val fruitsTuple = ("Apple", 2, "Red", 3.24)įruitsTuple: (String, Int, String, Double) = (Apple,2,Red,3.24)Īnd There is another way to create Tuple in Scala using ->
We can create the Tuple in Scala in 2 ways : Tuple is immutable i.e which can be changed like a list in Scala and it is not like an Array in Scala. in the below example i have created tuple called Fruits_tuple which holds fruit name, count, color and cost of it.we need to understand Scala tuple is not a collection to hold multiple or collections of unlimited item, It has a limitation to hold the number of items into a single tuple. Of course, if the title of a thread says "Why does Java not have anything like Tuple of Scala?", that does suggest we're talking about a strongly-typed variant.Scala Tuple is used to hold different values of different types. But it's a fair point that "tuple" in the outside world does not imply strong typing. People who don't want strongly typed probably aren't using Java anyway. When I see people discussing "why aren't there tuples in Java", I generally interpret it as why haven't any of these strongly-typed implementations made it into the standard library. I'm sure I've seen other home-grown typed Pair classes lurking within other libraries. Of course, they have concise data types already, so who needs tuples as well? And we can also point to standard Java's Map.Entry as a typed tuple. Kotlin still has Pair but dropped their other Tuple implementations.
Google Guava did have tuples at one point I think, with the annotation, but dropped them, explanation here. Apache Commons has Pair and Triple classes. I agree that an Object array would not be strongly typed at all, and a List would be little better since we really want different types for the different elements.īut various people have come up with more strongly-typed Java implementations, where a Pair means a tuple of two elements, the first of type A, and the second of type B, and the compiler can know the type of each one in different contexts. Click here to know more about mutability and immutability. A tuples purpose is to combine a fixed and finite number of items together to allow the programmer to pass a tuple as a whole. Well, I suppose the problem is there is no standard Tuple implementation for Java, and we're coming from different directions and thinking of different workarounds that people have used. In Scala, a tuple is a class that gives us a simple way to store heterogeneous items or different data types in the same container.
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