Functions and collections
Functions are values, and collections provide map, filter and fold.
What you will be able to do
- Define functions with def.
- Pass lambdas with =>.
- Use map, filter and foldLeft.
In plain English
Functions are values, and collections provide map, filter and fold.
- Define functions with def.
- Pass lambdas with =>.
- Use map, filter and foldLeft.
val lessons = List(("HTML", 12), ("CSS", 18))
val titles = lessons.filter(_._2 >= 15).map(_._1)
val total = lessons.map(_._2).sum
println(titles, total)Your turn
EasyExplain it back
Answer from memory: Which method transforms every element?
TEXT · starter
Your answer…Check your understanding before moving on.
Knowledge checkQuestion 1
Which method transforms every element?
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