Scala: Ignore Future return value, but chain them

Question

How should I write code, when I do not care about the returned value.

Example:

for {
    a <- getA // I do not care about a, but I need to wait for the future to finish
    b <- getB
} yield (b)

Answer 1

Like this

for {
     _ <- getA 
     b <- getB
} yield (b)