Scala tuples

Scala tuple:
Scala tuple is a class and combines a fixed number of items together so that they can be passed around as a whole.

Note:

• Unlike an array or list, a tuple can hold objects with different types but they are also immutable.
• A tuple isn't actually a collection; it's a series of classes named Tuple2, Tuple3, etc., through Tuple22.

Example:
Little bag or container you can use to hold things and pass them around.

1)Creating tuples:
Tuples can be created in two ways:

1. Using the enclosing elements in parentheses.
2. Creating a tuple with ->

i)Using the enclosing elements in parentheses:
 
Ex:

val tupleex = (1,"Mano")

To get to know the tuple class:

tupleex.getClass()

ii)Creating a tuple with ->:
We can also create tuple with ->, mostly useful at Map collection.

2)Accessing tuple elements:

Accessing tuples in different ways:

1. Using underscore with position 
2. Use variable names to access tuple elements 
3. Iterating over a Scala tuple 
4. The tuple toString method

i)using underscore with position
We can access tuple elements using an underscore syntax. The first element is accessed with _1, the second element with _2, and so on.





Ex:


ii)Use variable names to access tuple elements:
When referring to a Scala tuple we can also assign names to the elements in the tuple.

Let's we try to do this when returning miscellaneous elements from a method.

Create method, that returns tuple:

def tuplemeth = (1,"Mano",24)

Create variables to hold tuple elements:

val(id,name,age) = tuplemeth

We can ignore the elements by using an underscore placeholder for the elements you want to ignore.

val(id,name,_) = tuplemeth

iii)Iterating over a Scala tuple
As mentioned, a tuple is not a collection; it doesn't descend from any of the collection traits or classes. However, we can treat it a little bit like a collection by using its productIterator method.

iv)The tuple toString method:
The tuple toString method gives you a good representation of a tuple.