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..10).cover?(5)
=> true

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

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..100).cover?(10..20)
=> true

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

(5..).cover?(4..)
=> false

("a".."d").cover?("x".."z")
=> false

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