Scala check if element is present in a list

Question

I need to check if a string is present in a list  and call a function which accepts a boolean accordingly   Is it possible to achieve this with a one liner   The code below is the best I could get   val strings   List  a    b    c   val myString    a   strings find x  gt x    myString  match     case Some      gt  myFunction true    case None   gt  myFunction false      I m sure it s possible to do this with less coding  but I don t know how

User · Answer

Even easier   strings contains myString

User · Answer

Just use contains  myFunction strings contains myString

User · Answer

In your case I would consider using Set and not List  to ensure you have unique values only  unless you need sometimes to include duplicates   In this case  you don t need to add any wrapper functions around lists

User · Answer

this should work also with different predicate      myFunction strings find       mystring   isDefined

User · Answer

You can also implement a contains method with foldLeft  it s pretty awesome  I just love foldLeft algorithms   For example   object ContainsWithFoldLeft extends App      val list    0 to 10  toList   println contains list  10     true   println contains list  11     false    def contains A  list  List A   item  A   Boolean         list foldLeft false   r  c    gt  c equals item     r

User · Answer

And if you didn t want to use strict equality  you could use exists    myFunction strings exists   x    customPredicate x

[string] Scala check if element is present in a list

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