Check if two ranges overlap in ruby

Question

I know that I can do:

(1..30).cover?(2)
=> true

But when I try to do the same with another range it always returns false:

(1..30).cover?(2..3)
=> false

So my question is - is there any elegant way to compare two ranges in ruby? In my case I want to check if two DateTime-ranges overlap. Thanks in advance.

Answer 1

There is Range#overlap? In Ruby 3.3+

It returns true if ranges overlap each other, otherwise false

It works with different kinds of ranges:

(5..10).overlap?(10..20)
# => true

('a'..'e').overlap?('b'..'f')
# => true

It returns false when begin > end:

(5..1).overlap?(2..3)
# => false

It returns false when try to check incomparable kinds of ranges:

(5..10).overlap?('a'..'e') 
# => false

It works with exclusive ranges:

(5..10).overlap?(1...5)
# => false

(1...5).overlap?(5..10)
# => false

It works with endless and beginless ranges:

(1..).overlap?(..1)
# => true

(1..).overlap?(...1)
# => false

It raises error when try to pass not range

(1..5).overlap?(1)
# raise TypeError (expected Range)