If you want a deeper guide to Scala, when I was learning I used Programming Scala and Scala for Data Science.
Create A String
// Create a value called text that is a string
val text: String = "This is a sentence that we want to split along every space"
Array(This, is, a, sentence, that, we, want, to, split, along, every, space)
Split Up A String By Commas
// Create a value called csv_row that is a string and contains one row of data
val csv_row: String = "Billy, Miller, 22, Baker, High School"
// Split up that row by commas
Array(Billy, " Miller", " 22", " Baker", " High School")