DevSession: add exercise files

Author: imamrb

DevSession/Gemfile

@@ -0,0 +1 @@
+gem 'pry'

DevSession/Gemfile.lock

@@ -0,0 +1,16 @@
+GEM
+  specs:
+    coderay (1.1.3)
+    method_source (1.0.0)
+    pry (0.14.1)
+      coderay (~> 1.1)
+      method_source (~> 1.0)
+
+PLATFORMS
+  arm64-darwin-20
+
+DEPENDENCIES
+  pry
+
+BUNDLED WITH
+   2.3.18

DevSession/demo.rb

@@ -0,0 +1,25 @@
+require 'pry'
+
+class User
+  attr_reader :args
+
+  def initialize(**args)
+   @args = args
+  end
+
+  def save!
+    users_db.write({ id: find_id, name: args[:name]}.to_json)
+    users_db.write("\n")
+  end
+
+  def find_id
+    binding.pry
+    users_db.read.split('\n').last[:id]  + 1
+  end
+
+  def users_db
+    File.open('users.json', 'a+')
+  end
+end
+
+User.new(id: 1, name: 'Istiak').save!

DevSession/employee.rb

@@ -0,0 +1,28 @@
+require './user'
+
+class Employee < User
+  attr_accessor :dept
+
+  def initialize(name: , age: , dept:)
+    @dept = dept
+    super
+  end
+
+  def age
+    p = Proc.new { "age is #{self.age}" }
+    super(p)
+  end
+end
+
+# puts "Please enter name: "
+# name = gets
+
+# puts "Please enter age: "
+# age = gets
+
+# puts "Please enter dept: "
+# dept = gets
+
+emp = Employee.new(name: 'Test', age: 20, dept: 'JS')
+
+puts emp.dept, emp.name, emp.age

DevSession/test.rb

@@ -0,0 +1,58 @@
+
+class String
+  def empty?
+    !self
+  end
+
+  def blank?
+
+  end
+
+  def split_by_space
+    self.split(' ')
+  end
+
+  def method_missing(block)
+   if block.to_s == 'no_method'
+      puts "Please define your method"
+   else
+     super
+   end
+  end
+end
+
+class Test
+  class NotFoundError < StandardError
+    def initialize(key: )
+      @key = key
+    end
+
+    def to_s
+      "The key: #{@key} you are looking for can not be found! "
+    end
+  end
+
+  def calculate(**args)
+    error_handler do
+      if args[:name].blank?
+        raise NotFoundError.new(key: 'name')
+      end
+
+      puts 100 / 8
+    end
+  end
+
+  def error_handler
+    yield
+  rescue ZeroDivisionError
+    puts "You can not devide by zeror"
+  rescue NotFoundError => e
+    puts e.to_s
+  rescue StandardError => e
+    puts "Unkown error! please check"
+    puts e.inspect
+  end
+end
+
+puts "This is my string".no_method_1
+Test.new.calculate(name: '')

DevSession/user.json

@@ -0,0 +1 @@
+{:id=>1, :name=>"Istiak"}

DevSession/user.rb

@@ -0,0 +1,54 @@
+class User
+  attr_accessor :name, :age
+
+  @@counter = 0
+
+  def initialize(name:, age:, **args)
+    @name = name
+    @age = age
+    @args = args
+    puts args.inspect
+  end
+
+  def self.counter
+    @@counter
+  end
+
+  def self.counter=(arg)
+    @@counter += 1
+  end
+
+  def age(p)
+    p.call
+  end
+
+  # def name
+  #   @name
+  # end
+
+  # def age
+  #   @age
+  # end
+
+  # def name=(arg)
+  #   @name = arg
+  # end
+
+  # def age=(arg)
+  #   @age = arg
+  # end
+end
+
+# puts User.counter
+
+# user = User.new(name: 'Istiak', age: 10)
+# user2 = User.new(name: 'Mujhahid', age: 20)
+# puts user.inspect
+# puts user.name
+# puts user.age
+# user.name = 'Sadman'
+
+# puts user.name
+# puts user.inspect
+
+# puts User.counter

DevSession/users.json

@@ -0,0 +1,5 @@
+{:id=>1, :name=>"Istiak"}
+{:id=>1, :name=>"Istiak"}
+{:id=>1, :name=>"Istiak"}
+{:id=>1, :name=>"Istiak"}
+{:id=>1, :name=>"Istiak"}