Concatenate Lists

The triple-colon operator (:::) concatenates lists to create a new, combined list.

In Twenty-One, there are two major organizations that host competitive tournaments: the National Twenty-One Assocation (NTOA) and EuroTO, based in North America and Europe, respectively. Each league has a list of venues where they host their tournaments, venuesNTOA and venuesEuroTO. Recently, there was a merger of the organizations that made Twenty-One an overseas endeavor. NTOA and EuroTO were combined to create Twenty-One World. That means the list of venues must be combined, as tournaments will be played in both continents now.

In this exercise, you'll use the concatenation operator (:::) to create a new, combined venue list for Twenty-One World.

本练习是课程的一部分

Introduction to Scala

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练习说明

Create the venuesNTOA list using List().
Create the venuesEuroTO list using the cons operator (::).
Concatenate venuesNTOA and venuesEuroTO to create a new list named venuesTOWorld.

交互式实操练习

通过完成这段示例代码来试试这个练习。

// The original NTOA and EuroTO venue lists
val venuesNTOA = ___("The Grand Ballroom", "Atlantis Casino", "Doug's House")
val venuesEuroTO = "Five Seasons Hotel" ___ "The Electric Unicorn" ___ Nil

// Concatenate the North American and European venues

编辑并运行代码