Question

When c map equals a function of a map I can calculate it as

val a: Map[T, U] = ...
def f(aValue: U): V = ...
val c: Map[T, V] = a.map(f)

but what if c map equals a function of both a and b as arguments? For example if a, b and c are Map[String, Int] and a c values are to equal corresponding a values raised to powers specified by corresponding b values?

Answer 1

Is this what you’re after?

val a = Map('a -> 2, 'b -> 3)
val b = Map('a -> 4, 'b -> 5)
a.map{ case (k, aVal) => (k, aVal + b(k)) } // Map('a -> 6, 'b -> 8)