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Assignments/assignment6/assignment6.ex

+#Define a module and struct Employee, and add struct fields:
+
+#first name
+#last name
+#id number
+#salary
+#job, which is one of the {:none, :coder, :designer, :manager, :ceo }
+
+#id number has a default value that is previous id + 1
+#salary has a default value 0
+#job has a default value of :none
+
+#Implement functions Employee.promote and Employee.demote which updates the job accordingly.
+#job :none salary is set to 0
+#each job above :none gets 2000 more salary than previous
+
+#Test your Employee module and its promote and demote functions.
+
+defmodule Employee do
+
+    defstruct [
+        :first_name,
+        :last_name, 
+        id_number: 0, 
+        salary: 0, 
+        job: :none
+    ]
+
+    def new_employee(firstname, lastname) do
+        %Employee{first_name: firstname, last_name: lastname}
+    end
+
+    #promoting
+    def promote(%Employee{} = employee) do
+        new_job = promotion(employee.job)
+        new_salary = update_salary(new_job)
+
+        %Employee{employee | job: new_job, salary: new_salary}
+    end
+
+    #demoting
+    def demote(%Employee{} = employee) do
+        new_job = demotion(employee.job)
+        new_salary = update_salary(new_job)
+
+        %Employee{employee | job: new_job, salary: new_salary}
+    end
+
+    defp update_salary(:none), do: 0
+    defp update_salary(job), do: 2000 + update_salary(demotion(job))
+
+    #promotion order
+    defp promotion(:none), do: :coder
+    defp promotion(:coder), do: :designer
+    defp promotion(:designer), do: :manager
+    defp promotion(:manager), do: :ceo
+
+    #demotion order
+    defp demotion(:ceo), do: :manager
+    defp demotion(:manager), do: :designer
+    defp demotion(:designer), do: :coder
+    defp demotion(:coder), do: :none
+
+end
+