Ruby 3.1 allows value omission in hash literals

Ruby 3.1 adds the ability to use hash literals without having a value.

Ruby 3.1 adds try_convert method to Integer class for implicit conversions

try_convert for Integer will convert the object into an instance of the class via the implicit conversion method to_int and returns nil if no implicit conversion method is defined.

Ruby 3.1 introduces pattern matching pin operator against expression

Ruby 3.1 adds support for the expression and range when using the pattern matching pin operator.

Ruby 3.1 adds Enumerable#compact and Enumerator::Lazy#compact

Ruby 3.1 adds Enumerable#compact and Enumerator::Lazy#compact to return a copy of `self` with all `nil` elements removed.

Ruby 3.1 Enumerable#tally now accepts an optional hash to count occurrences

Ruby 3.1 extends the functionality of the Enumerable#tally method introduced in Ruby 2.7. We can now pass another hash whose counts would be added to the resulting tally hash.

Ruby 3.1 adds Array#intersect? method

Ruby Array#intersect? method will return true or false based on common elements present in the two arrays.

Ruby 3.1 evaluates multiple assignments from left to right

Ruby changes the evaluation order for multiple assignments from left to right making it consistent with single assignment evaluation order.

Ruby 3.0 adds `Hash#except` and `ENV.except`

Ruby 3.0 adds `Hash#except` to return a new hash that includes everything from the original hash except the given keys. `ENV` also gets support for `except`.

Ruby adds support for forwarding arguments to a method, along with the leading arguments

... operator was limited to forwarding arguments. With Ruby 3.0, it can forward the arguments along with the leading arguments.

Ruby adds `Symbol#name` to return frozen string corresponding to the symbol name

Ruby has added `Symbol#name`, which returns the name of the symbol if it is named. The returned string can not be modified.