typo: include brakets
refactor: extract method to a member method into a new class
refactor: move static method to a class
refactor: call to a method on the same object instance
refactor: move static method to a class
refactor: call to a method on the same object instance
refactor: use only one method in the NumberFilter class
refactor: rename variable
add a README file
refactor: move a boundary check where it makes more sense
refactor: rename public method