Actually it’s almost the same: my_key = :name my_hash = { name: ‘Joe’, age: 52 } my_hash[my_key] #=> “Joe” See http://www.ruby-doc.org/core-2.1.1/Hash.html solved Ruby hashes, getting a key which programatically changes [closed]
Here’s one way: def natural_numerals(value) results = [] (1..value-1).each {|i| (i..value-1).each {|j| results << (i..j).to_a.join(“+”) if (i+j)*(j-i+1)/2 == value}} if results.empty? then nil else results end end output1 = natural_numerals(15) output2 = natural_numerals(4) puts output1.inspect #=> [“1+2+3+4+5”, “4+5+6”, “7+8”] puts output2.inspect #=> nil solved How to split a Number to Natural Numerals in Ruby [closed]
As @Pavan said in the comment, your conditional might be wrong. It should be == instead of =. = is the assignment. if @weight.nominal + x == required … end Here what happens “behind the scene” with your original code: required is assigned to x. Add x to @weight.nominal (@weight.nominal + x) Evaluate the result … Read more
You can use the include? method of ruby’s Array if [‘trail’, ‘active’].include?(@subscription.state) #do something end solved Check if item is included in an array or hash [closed]
This does feel a lot like a school project/task rather than anything meaningful. There are libraries built into Ruby that you can use for high performance Prime calculations puts “Enter the maximum number of the range in which to find the prime numbers: ” last = gets.chomp.to_i prime = [2] all_numbers = (2..last).to_a print “We … Read more
It looks like you tried to create your own JSON serializer, instead of using the one that comes with Ruby. Or, perhaps you didn’t realize that JSON was a thing and wanted to store arrays of hashes and tried to invent your own. Either way, it wasn’t a good path to follow. This is your … Read more
require ‘json’ JSON.parse(input)[‘result’].map do |h| [h[‘instanceName’], h[‘status’]] end.to_h #⇒ { # “920_ENT_6017” => “RUNNING”, # “920_JAS_8082” => “RUNNING”, # “AIS_0005” => “RUNNING”, # “DEN00KNL_DEP_920” => “RUNNING”, # “ENT6547” => “STOPPED”, # “HTML_8792” => “RUNNING”, # “RTE_0004” => “RUNNING”, # “ent4563” => “STOPPED”, # “ent6021” => “RUNNING”, # “ent6060_Win” => “RUNNING”, # “ent6327” => “STOPPED”, # … Read more
You are calling the employee_id method on authorization_selectedwhich is a String and does not provide this method. Obviously this does not work. You probably want to do @portability = Portability.new @portability.employee_id = authorization_selected assuming that params[:employee] contains the employee_id and Portability is an ActiveModel or an ActiveRecord. Perhaps you can change your form that the … Read more
I would suggest something like this: /\) (?!.*\))(\S+)/ rubular demo Or if you don’t want to have capture groups, but potentially slower: /(?<=\) )(?!.*\))\S+/ rubular demo (?!.*\)) is a negative lookahead. If what’s inside matches, then the whole match will fail. So, if .*\) matches, then the match fails, in other terms, it prevents a … Read more
Let’s say you have person.rb: Class Person ……. end and you have dog.rb: class Dog …….. end If you want to access to Dog class inside Person you have to include it. That means your dog.rb would be: require ‘dog’ class Person def my_method dog = Dog.new() end end require ‘name_of_file_with_class’ This is just a … Read more
The error Permission Denial: starting instrumentation Component means that you don’t have the right debug key. If you have the keystore and it was working before then check that the keystore hasn’t been updated. If you don’t have the keystore you can resign the app with your own. calabash-android resign app.apk From – https://github.com/calabash/calabash-android/wiki/Running-Calabash-Android The … Read more
a = [{“user”=>”a1”, “drink”=>”d1”, “price”=>”60”}, {“user”=>”a2”, “drink”=>”d2”, “price”=>”30”}, {“user”=>”a3”, “drink”=>”d3”, “price”=>”30”}, {“user”=>”a2”, “drink”=>”d4”, “price”=>”40”}] b = [] a.each_with_object({}) do |x| count = b.find {|y| y[“user”] == x[“user”] } if count.nil? b << x else count[“price”] = count[“price”].to_i + x[“price”].to_i count[“price”] = count[“price”].to_s end end puts b 1 solved I have a array of hash in … Read more
If you’re using Rbenv : https://makandracards.com/makandra/21545-rbenv-how-to-switch-to-another-ruby-version-temporarily-per-project-or-globally If you’re using RVM : https://rvm.io/rubies/default If you’re not using any of these: you should be using one of these. solved Change the version of ruby [closed]
If you want to alter the var in place: str=”\”1,2,3,4\”” str.gsub!(‘”‘, ”) puts str # 1,2,3,4 2 solved Remove double quotes from a string rails 4
Furthering Sergio’s answer, you can isolate the letter-ordinals and use modulo. class String def plus n case self when (‘a’..’z’) (((ord – 97 + n) % 26) + 97).chr #ord means self.ord when (‘A’..’Z’) (((ord – 65 + n) % 26) + 65).chr else raise “single-letters only” end end end ‘a’.plus 2 #=> ‘c’ ‘z’.plus … Read more