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21 Answered Questions for the topic Ruby

Describe the four pillars of object oriented programming

Encapsulation, Inheritance, Abstraction, Polymorphism

Creating An Air Pollution Index Reader in Ruby (Straight Forward Question)

I got stuck halfway with this question, im unable to post the image because im required to get 10 reputation points here lol. So i literally recreated the whole question here. There were no files... more
Ruby Php Perl

07/29/19

Is dynamic language always interpreted?

Looking at most (if not all) dynamic languages [i.e Python, PHP, Perl and Ruby], they are all interpreted. Correct me if I'm wrong. Is there any example of dynamic language that goes through... more

06/13/19

Safe integer parsing in Ruby?

I have a string, say `'123'`, and I want to convert it to `123`.I know you can simply do `some_string.to_i`, but that converts `'lolipops'` to `0`, which is not the effect I have in mind. I want it... more
Ruby

06/12/19

Map and Remove nil values in Ruby?

I have a map which either changes a value or sets it to nil. I then want to remove the nil entries from the list. The list doesn't need to be kept.This is what I currently have:<!-- language:... more
Ruby

06/11/19

How to document Ruby code?

Are there certain code conventions when documenting Ruby code? For example I have the following code snippet: require 'open3' module ProcessUtils # Runs a subprocess and applies... more
Ruby Regex

06/07/19

Match all occurrences of a regex?

Is there a quick way to find every match of a regular expression in Ruby? I've looked through the Regex object in the Ruby STL and searched on Google to no avail.
Ruby

06/07/19

How many types of variables are used in Ruby and what are they?

06/07/19

Test whether a Ruby class is a subclass of another class?

I would like to test whether a class inherits from another class, but there doesn't seem to exist a method for that. class A end class B < A end B.is_a? A => false ... more
Ruby Terminal

06/07/19

How to execute a Ruby script in Terminal?

I've set everything up that I need on my Mac (Ruby, Rails, Homebrew, Git, etc), and I've even written a small program. Now, how do I execute it in Terminal? I wrote the program in Redcar and saved... more
Ruby

06/06/19

What is the difference between the Object methods clone and dup?

06/06/19

Undo scaffolding in Rails?

Is there any way to 'undo' the effects of a scaffold command in Rails?
Ruby String

05/30/19

How to check whether a string contains a substring in Ruby?

I have a string variable with content as follows: varMessage = "hi/thsid/sdfhsjdf/dfjsd/sdjfsdn\ " "/my/name/is/balaji.so\ " ... more

05/30/19

How do I create an average from a Ruby array?

How would get find an average from an array?If I have the array: [0,4,8,2,5,0,2,6]Averaging would give me 3.375.Thanks!

05/22/19

In Ruby, how do I skip a loop in a .each loop, similar to 'continue'?

In Ruby, how do I skip a loop in a `.each` loop, similar to `continue` in other languages?
Ruby String Arrays

04/29/19

How to split a delimited string in Ruby and convert it to an array?

I have a string `"1,2,3,4"` and I'd like to convert it into an array: [1,2,3,4]How?
Ruby

03/18/19

What is attr_accessor in Ruby?

I am having a hard time understanding `attr_accessor` in Ruby. Can someone explain this to me?
Ruby Arrays Loops

03/18/19

What is the "right" way to iterate through an array in Ruby?

PHP, for all its warts, is pretty good on this count. There's no difference between an array and a hash (maybe I'm naive, but this seems obviously right to me), and to iterate through either you... more

03/18/19

Convert string to symbol-able in Ruby?

Symbols are usually represented as such :book_author_titlebut if I have a string: "Book Author Title"is there a built in way in rails/Ruby to convert it into a symbol where I can use the `:` ... more
Ruby

02/27/15

Using Ruby Programming

Design a class Rational for fractions (n, d), d > 0 where both are relatively prime integers with gcd(n, d) = 1. Again provide constructors, accessors, mutators, to string, to double, etc. as... more

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