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I want to create different methods for a class called Multiset. I have all the required methods, but I’m unsure of how to write intersection, union, and subset methods....
How do you round a float to 2 decimal places in JRuby(1.6.x)? number = 1.1164 number.round(2) # The above shows the following error # wrong number of arguments (1...
Here is some code: class Person def initialize(age) @age = age end def age @age end def age_difference_with(other_person) (self.age - other_person.age).abs end protected :age end What I want to...
Example: [12,23,987,43 What is the fastest, most efficient way to remove the “...
arr is array of strings: ["hello", "world", "stack", "overflow", "hello", "again"] What would be an easy and elegant way to check if arr has duplicates, and if so, return...
I’m trying to create a new file and things don’t seem to be working as I expect them too. Here’s what I’ve tried: File.new "out.txt" File.open "out.txt" File.new "out.txt","w"...
List the ruby versions console:~$ rvm list rvm rubies ruby-2.0.0-p481 [ i686 ] # => - current # =* - current && default # * - default Try to...
This question already has answers here: Difference between “and” and && in Ruby? (8 answers) Closed 2 years ago. What’s the difference between the or and || operators in...
There are instances where I would like to revert and uninstall all previous gem installations. For instance, I needed to assist a friend migrate their rails development machine to...