Why do people say that Ruby is slow? [closed]
Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so … Read more
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How can I get the intersection, union, and subset of arrays in Ruby?
I want to create different methods for a class called Multiset. I have all the required methods, but I’m unsure of how to … Read more
How do you round a float to 2 decimal places in JRuby?
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 … Read more
Instance variable: self vs @
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 … Read more
What is the easiest way to remove the first character from a string?
Example: [12,23,987,43 What is the fastest, most efficient way to remove the “[“, using maybe a chop() but for the first character? 15 … Read more
How to find and return a duplicate value in array
arr is array of strings: [“hello”, “world”, “stack”, “overflow”, “hello”, “again”] What would be an easy and elegant way to check if arr … Read more
How to create a file in Ruby
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: … Read more
RVM is not a function, selecting rubies with ‘rvm use …’ will not work
List the ruby versions console:~$ rvm list rvm rubies ruby-2.0.0-p481 [ i686 ] # => – current # =* – current && default … Read more
Difference between “or” and || in Ruby? [duplicate]
This question already has answers here: Difference between “and” and && in Ruby? (8 answers) Closed 2 years ago. What’s the difference between … Read more
Uninstall all installed gems, in OSX?
There are instances where I would like to revert and uninstall all previous gem installations. For instance, I needed to assist a friend … Read more