Access `self` of an object through the parameters

Question

Let\'s say I want to access an element of an array at a random index this way:

[1, 2, 3, 4].at(rand(4))

Is there a way to pass the size of

Answer 1

You could do something similar with lambda:

getrand = ->(x) { x[rand(x.count)] }
getrand.call [1,2,3]
# => 2