pure_otp_exercise.md

Pure OTP Exercise

Create a todo list using only pure processes

1. Add a todo to a todo-list

TODO.add(%{ title: "study otp", completed: false })
=> %{ id: "md5-943jg4938j39", title: "study otp", completed: false,  created_at:"2018-10-02" }

2. List todos

TODO.list
=> [ %{ id: "md5-f0932jf934", title: "study otp", completed: false } ]

3. Mark todo as completed

TODO.complete("md5-943jg4938j39")
=> %{ id: "md5-943jg4938j39", title: "study otp", completed: true, created_at: "2018-10-03", completed_at:"2018-10-03" }

4. Add validation to not allow duplicated todos titles

TODO.add(%{ title: "study otp", completed: false })
=> %{ id: "md5-943jg4938j39", title: "study otp", completed: false,  created_at:"2018-10-02" }

TODO.add(%{ title: "study otp", completed: false })
=> %{ error: "task already created"}

5. Add validation to not allow completion on already completed tasks

TODO.complete("md5-943jg4938j39")
=> %{ id: "md5-943jg4938j39", title: "study otp", completed: true, created_at: "2018-10-03", completed_at:"2018-10-03" }

TODO.complete("md5-943jg4938j39")
=> %{ error: "task already completed"}

6. Add Supervision to the Application, when the todo process crashes it will be restarted automatically

7. Tests