Explore Scala's collection methods

[sanmai]

https://docs.scala-lang.org/scala3/book/collections-methods.html

Here are some methods that don’t use lambdas:

val a = List(10, 20, 30, 40, 10)      // List(10, 20, 30, 40, 10)

a.distinct                            // List(10, 20, 30, 40)
a.drop(2)                             // List(30, 40, 10)
a.dropRight(2)                        // List(10, 20, 30)
a.head                                // 10
a.headOption                          // Some(10)
a.init                                // List(10, 20, 30, 40)
a.intersect(List(19,20,21))           // List(20)
a.last                                // 10
a.lastOption                          // Some(10)
a.slice(2,4)                          // List(30, 40)
a.tail                                // List(20, 30, 40, 10)
a.take(3)                             // List(10, 20, 30)
a.takeRight(2)                        // List(40, 10)

Higher-order functions:

a.dropWhile(_ < 25)   // List(30, 40, 10)
a.filter(_ > 100)     // List()
a.filterNot(_ < 25)   // List(30, 40)
a.find(_ > 20)        // Some(30)
a.takeWhile(_ < 30)   // List(10, 20)