logo
down
shadow

How to implement custom mutating methods in Ruby?


How to implement custom mutating methods in Ruby?

By : yuexuanwo
Date : November 28 2020, 08:01 AM
To fix this issue I don't think you can implement val //= 23, which Perl refers to as "dor" (defined-or). There's no underlying method call. Instead, val ||= 23 is compiled into...
code :
if !val
  val = 23
end
if val.nil?
  val = 23
end
class Object
  def dor(value)
    self = value if self.nil?
  end
end

Can't change the value of self
    self = value if self.nil?
class Object
  def dor(value)
    value if self.nil?
  end
end

obj = obj.dor(42)
puts obj
obj = 42 if obj.nil?
puts obj


Share : facebook icon twitter icon
How to implement custom validations for methods called by other methods?

How to implement custom validations for methods called by other methods?


By : Marco
Date : March 29 2020, 07:55 AM
I wish this helpful for you You could modify plan_subscribable? to return a boolean true or a string containing the specific error message:
code :
def plan_subscribable?(plan)
  return 'The number of users cannot be higher than the plan quantity' unless users_subscribed <= plan.quantity
  return 'Archived plans are not subscribable' unless plan.archived == false
  return true
end
def create_subscription(plan_title)
  plan = Plan.where(title: plan_title).first

  subscribable_or_error = plan_subscribable?(plan)
  if subscribable_or_error === true
    Subscription.create(...)
  else
    error_message = subscribable_or_error
  end
end
How to implement goto and label methods in Ruby?

How to implement goto and label methods in Ruby?


By : Joris Ebbelaar
Date : March 29 2020, 07:55 AM
around this issue Here's an idea: pre "parse" your assembly code and then execute it. This consists of changing a few things. Here would be my implementation of the Memory class:
code :
class Memory
  attr_reader :table
  def initialize
    @table = { ax: 0, bx: 0, cx: 0, dx: 0 }
    @program = []
    @labels = {}
  end
  OPS = {
    "mov" => lambda {|dest, src| @table[dest] = (src.is_a?(Symbol) ? @table[src] : src); nil},
    "inc" => lambda {|dest, incval = 1| @table[dest] += incval; nil},
    "jmp" => lambda {|lblname| @labels[lblname]}
    #and so on
  }
  def method_missing(name, *args)
    if(OPS.keys.include?(name.to_s)) 
      @program << [name.to_s, args]
    elsif(name.to_s == "label")
      @labels[args.first] = @program.length
    else
      return name
    end
  end
  def load_program(&block)
    self.instance_exec(&block)
  end
  def run_program
    pc = 0
    until(pc == @program.length)
      instruction = @program[pc]
      retval = self.instance_exec(*instruction[1], &OPS[instruction[0]])
      if(retval)
        pc = retval
      else
        pc += 1
      end
    end
  end
  def asm(&block)
    load_program(&block)
    run_program
    @table
  end
end
How to implement Ruby utility class methods?

How to implement Ruby utility class methods?


By : user28203
Date : March 29 2020, 07:55 AM
it fixes the issue You aren't using the Temperature class how you defined it. You take an options hash with :f and :c keys in it in the Temperature class, but don't set those in your sub-classes.
Try this:
code :
class Celsius < Temperature
  def initialize temp
    super(c: temp)
  end
end

class Fahrenheit < Temperature
  def initialize temp
    super(f: temp)
  end
end
How to implement read-only var with mutating get

How to implement read-only var with mutating get


By : Diogennifer of Sinop
Date : March 29 2020, 07:55 AM
like below fixes the issue I have a var ,
i don't need to set, only get
code :
   func getSoketTasksList() -> Set<CXSocketTask> {
       return socketManager.tasksList
   }
   getSoketTasksList().remove(task)
class CXSocketTask:NSObject{}
class SocketManager {
    var tasksList = Set<CXSocketTask>()
}
let task = CXSocketTask()
let socketManager = SocketManager()
socketManager.tasksList.insert(task)

func getSoketTasksList() -> Set<CXSocketTask> {
    return socketManager.tasksList
}
getSoketTasksList().remove(task)
Method to find just my custom methods I wrote, not any inherited methods (Ruby)

Method to find just my custom methods I wrote, not any inherited methods (Ruby)


By : user2861662
Date : March 29 2020, 07:55 AM
wish helps you You can use Foo.instance_methods(false) to get the instance methods, and Foo.methods(false) to get the class methods.
The false argument is saying dont show inherited methods.
Related Posts Related Posts :
  • macOS Mojave 'ruby/config.h' file not found
  • How to delete attr_accessor in ruby
  • How to reversibly escape a URL in Ruby so that it can be saved to the file system
  • Point belonging to which Polygon
  • Precedence operators in Ruby from Haskell?
  • How to install command line tools on OSX Mavericks
  • When making network requests, when should I use Threads vs Processes?
  • how to call method in one application from another application in ruby on rails
  • LoadError on line ["51"] when trying compass watch command
  • Why does `Dir[directory_path].empty?` return `false` all the time?
  • ruby conjunction and union operators
  • Ruby - watch for file with extension being updated
  • How do I have Ruby YAML dump a Hash subclass as a simple Hash?
  • How do I get ruby-prof to ignore Ruby core / standard library / gem methods?
  • How do I give my instance variable a getter?
  • syntax error, unexpected '=', expecting keyword_end
  • Symbol literal or a method
  • Singleton logger usage in ruby
  • Difficult code packaging design
  • Passing absent parameters
  • Is there a more efficient way of ensuring my database gets closed?
  • Take in escaped input in Ruby command line app
  • String with comma-separated values and newlines: split values and create arrays for each newline
  • Instance variables on Ruby main class
  • How do I cache user specific objects
  • How to specify the location of the chromedriver binary
  • How to setup "application/ld+json" schema.org meta data in rails 4 app
  • How to use String split[]
  • Capture Ruby Logger output for testing
  • Regex group match if present
  • Unusual use of module namespacing
  • Why doesn't this loop stop?
  • How do I run Rails/Rake from another directory?
  • Ruby Tempfile doesn't Create File on Disk
  • Consecutive letter frequency
  • Calling second-level function from the second level in Ruby
  • How do I use a Chef Resource in a Library
  • Ruby Method Name Interpolation
  • Weird behavior of #upcase! in Ruby
  • Ruby array access position in array
  • Ruby NameError: Undefined local variable
  • Using Nokogiri to validate XML: finding the line-nr of validation errors?
  • How to calling a function with arguments in one .rb script to another .rb script
  • Get and clear cookie using rest-client
  • invalid argument creating a ruby dev env with docker & fig
  • How can I better test equality for decorated objects?
  • Replace text in brackets gsub
  • Ruby's Array Combination Method
  • Don't have access to Heroku app
  • Take any hash keys and flatten into mixed array
  • Ruby On Rails Relationship Between Model, View, And Controller
  • Quitting method chain execution early
  • Data scrapping with Nokokiri and Pismo
  • Date format ends before converting entire input string
  • Rails 4: display values for lookups
  • Search for uppercased substring
  • Check params presence in Grape
  • How to create a method that checks if string1 can be rearranged to equal string2?
  • shadow
    Privacy Policy - Terms - Contact Us © ourworld-yourmove.org