wtf?! Infinite Ranges in Ruby

First let’s define an Infinity constant (since Ruby does not come with one):

Inf = 1.0 / 0.0

Now let’s see if we can create a Range Object with it:

(1..Inf)

Okay, no errors. Now let’s try to use it:

(1..Inf).include?(10000000) #=> true
(1..Inf).include?(-10) #=> false
(-Inf..0).include?(-1000) #=> true
(-Inf..Inf).include?(-1000.456) #=> true

Now let’s try using it as a ‘lazy’ list:

(1..Inf).each.take(5) #=> [1, 2, [...]