Can you supply arguments to the map(&:method) syntax in Ruby?

Question

You\'re probably familiar with the following Ruby shorthand (a is an array):

a.map(&:method)

For example, try the followin

Answer 1

There is another native option for enumerables which is pretty only for two arguments in my opinion. the class Enumerable has the method with_object which then returns another Enumerable.

So you can call the & operator for a method with each item and the object as arguments.

Example:

a = [1,3,5,7,9]
a.to_enum.with_object(2).map(&:+) # => [3, 5, 7, 9, 11]

In the case you want more arguments you should repeat the proccess but it's ugly in my opinion:

a = [1,3,5,7,9]
a.to_enum.with_object(2).map(&:+).to_enum.with_object(5).map(&:+) # => [8, 10, 12, 14, 16]