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scala> val two = (1,2) two: (Int, Int) = (1,2) scala> val one = (1,) <console>:1: error: illegal start of simple expression val one = (1,) ^ scala> val zero = () zero: Unit = () Is this:
val one = Tuple1(5) really the most concise way to write a singleton tuple literal in Scala? And does Unit work like an empty tuple?
Does this inconsistency bother anyone else?
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In Scala, a tuple is a value that contains a fixed number of elements, each with its own type. Tuples are immutable. Tuples are especially handy for returning multiple values from a method.
To generate a tuple with one element, a comma , is required at the end. For example, when connecting multiple tuples with the + operator, note that an error is raised if you try to add one element and forget a comma , .
Thankfully, Scala already has a built-in tuple type, which is an immutable data structure that we can use for holding up to 22 elements with different types.
A tuple is immutable, unlike an array in scala which is mutable. An example of a tuple storing an integer, a string, and boolean value. Type of tuple is defined by, the number of the element it contains and datatype of those elements.
really the most concise way to write a singleton tuple literal in Scala?
Yes.
And does Unit work like an empty tuple?
No, since it does not implement Product.
Does this inconsistency bother anyone else?
Not me.
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