How to define the Scala collection

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Scala provides a good collection implementation, providing some abstraction of the collection types.

Scala collections are divided into mutable and immutable collections.

Variable sets can be updated or expanded where appropriate. This means that you can modify, add, and remove elements of a collection.

Immutable sets, by contrast, never change. However, you can still simulate add, remove, or update operations. But these operations will return a new set in each case, leaving the original set unchanged.

Next, we will introduce you to several common collection types:

Number Collection and Description 1Scala List

A characteristic of a List is that its elements are stored in a linear fashion, and duplicate objects can be stored in the collection.

Refer to API documentation

2Scala Set

Set is the simplest kind of set. The objects in the collection are not sorted in a particular way and there are no duplicate objects.

Refer to API documentation

3Scala Map

Map is a collection of key objects and value objects mapped, each element of which contains a pair of key objects and value objects.

Refer to API documentation

4Scala tuple

Tuples are collections of values of different types

5Scala Option

Option[T] indicates a container that may or may not contain values.

6Scala Iterator

An iterator is not a container, but rather a method of accessing elements within a container one by one.

examples

The following code judgment demonstrates an example of the definition of all of the above collection types:

//define integer List

val x = List(1,2,3,4)

//Definition Set

val x = Set(1,3,5,7)

//Definition Map

val x = Map("one" -> 1, "two" -> 2, "three" -> 3)

//Create tuple of two elements of different types

val x = (10, "Runoob")

//Definition Option

val x:Option[Int] = Some(5) Thank you for reading. The above is the content of "How to define Scala collection". After studying this article, I believe you have a deeper understanding of how to define Scala collection. The specific use needs to be verified by practice. Here is, Xiaobian will push more articles related to knowledge points for everyone, welcome to pay attention!