Anonymous Functions

An anonymous function is one that does not have a name and is treated as a literal. We can rewrite the cubic function as: (x: Int) => x * x * x. Another example is: (x: Int, y: Int) => x + y.

Every anonymous function can be written with a def like normal functions. Therefore we can say that anonymous functions are syntactic sugar.

Using anonymous functions, we can rewrite the three sum functions more succinctly:
     def sumInts(a: Int, b: Int) = sum(x => x, a, b)
     def sumCubes(a: Int, b: Int) = sum(x => x * x * x, a, b)