Logic MKI

Question Type: logic

Questions

Please do the questions below:

Remove key that have null or undefined value:

Input:

[
  {
    "session_name": "first test",
    "classes": [
      {
        "class_name": undefined,
        "students": [
          {
            "student_name": "John"
          }
        ]
      }
    ]
  },
  {
    "session_name": null,
    "classes": [
      {
        "class_name": "second class",
        "students": [
          {
            "student_name": "Doe"
          }
        ]
      }
    ]
  }
]

Expected Result:

[
  {
    "session_name": "first test",
    "classes": [
      {
        "students": [
          {
            "student_name": "John"
          }
        ]
      }
    ]
  },
  {
    "classes": [
      {
        "class_name": "second class",
        "students": [
          {
            "student_name": "Doe"
          }
        ]
      }
    ]
  }
]

Remove duplicated data from array
- Input:
```
[1, 4, 2, 3, 5, 3, 2, 4]
```
- Expected Result:
```
[1, 2, 3, 4, 5]
```
Find missing number from the list
- Input:
```
[9, 6, 4, 2, 3, 5, 7, 0, 1]
```
- Expected Result:
```
8
```
Find prefix of the word from array of string
- Input:
```
['flower', 'flow', 'flight']
```
- Expected Result:
```
fl
```

Return a formatted array of sessions with list of classes & students

Input:

[
  {
    "session_id": 1,
    "time": "09:00",
    "student": {
      "student_id": 1,
      "name": "Adi"
    },
    "class": {
      "class_id": 1,
      "name": "A"
    }
  },
  {
    "session_id": 2,
    "time": "10:00",
    "student": {
      "student_id": 5,
      "name": "Surya"
    },
    "class": {
      "class_id": 3,
      "name": "C"
    }
  },
  {
    "session_id": 2,
    "time": "10:00",
    "student": {
      "student_id": 8,
      "name": "Edi"
    },
    "class": {
      "class_id": 4,
      "name": "D"
    }
  },
  {
    "session_id": 2,
    "time": "10:00",
    "student": {
      "student_id": 7,
      "name": "Dede"
    },
    "class": {
      "class_id": 4,
      "name": "D"
    }
  },
  {
    "session_id": 1,
    "time": "09:00",
    "student": {
      "student_id": 3,
      "name": "Bayu"
    },
    "class": {
      "class_id": 2,
      "name": "B"
    }
  },
  {
    "session_id": 1,
    "time": "09:00",
    "student": {
      "student_id": 2,
      "name": "Budi"
    },
    "class": {
      "class_id": 1,
      "name": "A"
    }
  },
  {
    "session_id": 1,
    "time": "09:00",
    "student": {
      "student_id": 4,
      "name": "Dharma"
    },
    "class": {
      "class_id": 2,
      "name": "B"
    }
  },
  {
    "session_id": 2,
    "time": "10:00",
    "student": {
      "student_id": 3,
      "name": "Maha"
    },
    "class": {
      "class_id": 3,
      "name": "C"
    }
  }
]

Expected Result:

[
  {
    "session_id": 1,
    "time": "09:00",
    "classes": [
      {
        "class_id": 1,
        "name": "A",
        "students": [
          {
            "student_id": 1,
            "name": "Adi"
          },
          {
            "student_id": 1,
            "name": "Budi"
          }
        ]
      },
      {
        "class_id": 2,
        "name": "B",
        "students": [
          {
            "student_id": 3,
            "name": "Bayu"
          },
          {
            "student_id": 4,
            "name": "Dharma"
          }
        ]
      }
    ]
  },
  {
    "session_id": 2,
    "time": "10:00",
    "classes": [
      {
        "class_id": 3,
        "name": "C",
        "students": [
          {
            "student_id": 5,
            "name": "Surya"
          },
          {
            "student_id": 6,
            "name": "Maha"
          }
        ]
      },
      {
        "class_id": 4,
        "name": "D",
        "students": [
          {
            "student_id": 7,
            "name": "Dede"
          },
          {
            "student_id": 8,
            "name": "Edi"
          }
        ]
      }
    ]
  }
]