Ruby 2.6 Range#cover? accepts Range object as argument

Range#cover? returns true if the object passed as argument is in the range.

1(1..10).cover?(5)
2=> true
Copy

Range#cover? returns false if the object passed as an argument is non-comparable or is not in the range.

Before Ruby 2.6, Range#cover? used to return false if a Range object is passed as an argument.

1>> (1..10).cover?(2..5)
2=> false
Copy

Ruby 2.6

In Ruby 2.6 Range#cover? can accept a Range object as an argument. It returns true if the argument Range is equal to or a subset of the Range.

1(1..100).cover?(10..20)
2=> true
3
4(1..10).cover?(2..5)
5=> true
6
7(5..).cover?(4..)
8=> false
9
10("a".."d").cover?("x".."z")
11=> false
Copy

Here is relevant commit and discussion for this change.