Ruby Closures HackerRank Solution

Hello coders, In this post, you will learn how to solve Ruby Closures HackerRank Solution. This problem is a part of the Ruby Tutorial series. One more thing to add, don’t straight away look for the solutions, first try to solve the problems by yourself. If you find any difficulty after trying several times, then look for the solutions.

Ruby Closures HackerRank Solution

Let’s get started with Ruby Closures Solution

Problem Statement

Closure is a function/method that:

► Can be passed around like an object.

It can be treated like a variable, which can be assigned to another variable, passed as an argument to a method.

► Remembers the value of variables no longer in scope.

It remembers the values of all the variables that were in scope when the function was defined. It is then able to access those variables when it is called even if they are in a different scope.

Example:

def plus_1(y)
x = 100
y.call #remembers the value of x = 1
end

x = 1
y = -> { x + 1 }
puts plus_1(y) #2

In this example, the variable x, which is closed within the lambda y, remembers its values. Here, x remembers its value as 1.

Blocks, Procs and Lambdas are closures in Ruby.

Task

You are given a partially complete code. Your task is to fill in the blanks (______).

 block_message_printer prints the message if the block exists.
 proc_message_printer prints the message inside a Proc.
 lambda_message_printer prints the message inside a Lambda.

Ruby Closures HackerRank Solution

def block_message_printer
    message = "Welcome to Block Message Printer"
    if block_given?
        yield
    end
  puts "But in this function/method message is :: #{message}"
end
message = gets
block_message_printer { puts "This message remembers message :: #{message}" }
#####################################################################################
def proc_message_printer(my_proc)
    message = "Welcome to Proc Message Printer"
    my_proc.call              #Call my_proc
    puts "But in this function/method message is :: #{message}"
end
my_proc = proc { puts "This message remembers message :: #{message}" }
proc_message_printer(my_proc)
    
######################################################################################    
    
def lambda_message_printer(my_lambda)
    message = "Welcome to Lambda Message Printer"
      my_lambda[]         #Call my_lambda
    puts "But in this function/method message is :: #{message}"
end
my_lambda = -> { puts "This message remembers message :: #{message}" }
lambda_message_printer(my_lambda)    
######################################################################################    

Note: This problem (Ruby Closures HackerRank)  is generated by HackerRank but the solution is provided by Chase2Learn. This tutorial is only for Educational and Learning purpose