A simple CRUD using SpringBoot and H2 database. This project is bootstrapped using spring initializr and built with Maven and Kotlin.

A simple function for detection of duplicates in a list of integers is available at the /duplicates endpoints. For example, a list [1,1,2] would return another list with only the repeating elements [1,1]. Please read more below for instructions how to start and test this application.

• Clone this repository.
• Open the Maven project in your favorite IDE.
• Ensure that all the dependencies are downloaded.
• Run the application. The default port is 8080.
• Use Postman, ThunderClient or any other client to test the endpoints.

• GET /duplicates/
  Returns all the duplicates entries registered in the in-memory database.

  Example: GET /duplicates/
  Response 200 OK 
  [
    {
      "id": 1,
      "input": "[1, 1, 1, 1, 4, 5, 6, 6]",
      "output": "[1, 1, 1, 1, 6, 6]"
    },
    {
      "id": 2,
      "input": "[2, 3, 3, 4]",
      "output": "[3, 3]"
    },
    {
      "id": 3,
      "input": "[1, 4, 5, 6]",
      "output": "[]"
    }
  ]
  

• GET /duplicates/{id}
  This endpoint returns a specific duplicate by its id.

  Example: GET /duplicates/2
  Response 200 OK
  {
    "id": 2,
    "input": "[2, 3, 3, 4]",
    "output": "[3, 3]"
  }
  

• POST /duplicates/
  Submit a string representing a list of integers to return the duplicates in the list.

  Example: POST /duplicates/
  
  Body:
  {
    "input": "[1, 1, 1, 1, 4, 5, 6, 6]"
  }
  
  Response 201 Created:
  {
    "id": 1,
    "input": "[1, 1, 1, 1, 4, 5, 6, 6]",
    "output": "[1, 1, 1, 1, 6, 6]"
  }
  

• DELETE /duplicates/{id}
  This endpoint deletes a specific duplicate by its id.

  Example: DELETE /duplicates/2
  Response: 204 No Content