Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 7 years ago. Improve this question I like Ruby on Rails and I use it for all my web development projects. … Read more
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. For intersection and union, my code starts like this: def intersect(var) x = Multiset.new end Here is an example: X = [1, 1, 2, 4] Y … Read more
I want to display dates in the format: short day of week, short month, day of month without leading zero but including “th”, “st”, “nd”, or “rd” suffix. For example, the day this question was asked would display “Thu Oct 2nd”. I’m using Ruby 1.8.7, and Time.strftime just doesn’t seem to do this. I’d prefer … Read more
I am trying to convert a name from snake case to camel case. Are there any built-in methods? Eg: “app_user” to “AppUser” (I have a string “app_user” I want to convert that to model AppUser). 10 Answers 10
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 for 0) 6 Answers 6
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 know is the difference between using @age and self.age in age_difference_with method. 6 Answers 6
I need to add timestamps (created_at & updated_at) to an existing table. I tried the following code but it didn’t work. class AddTimestampsToUser < ActiveRecord::Migration def change_table add_timestamps(:users) end end 21 Answers 21
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 Answers 15
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 one of them (no matter which)? Examples: [“A”, “B”, “C”, “B”, “A”] # => “A” or “B” [“A”, “B”, “C”] # => nil 23 Answers 23
I made a rails project with, rails new test_bootstrap. succeeded. moved to the project dir and added the gems gem “therubyracer” gem “less-rails” #Sprockets (what Rails 3.1 uses for its asset pipeline) supports LESS gem “twitter-bootstrap-rails” and run bundle install after that, i have this error. Installing libv8 (3.16.14.3) Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem … Read more
