Front-End Interview Experience At Atlassian

Interview Experience
1

Last week had a phone interview for a front-end position. The interviewer asked two questions. The first question was to write a function that returns an array of objects. The input should match the expected output.

const input = [
  {
    "value": "value0",
    "children": []
  },
  {
    "value": "value1",
    "children": [
      {
        "value": "value2",
        "children": [
          {
            "value": "value3",
            "children": []
          }
        ]
      },
      {
        "value": "value4",
        "children": []
      }
    ]
  },
  {
    "value": "value5",
    "children": []
  },
  {
    "value": "value6",
    "children": []
  }
];

const expected = [
  {"value":"value0"},
  {"value":"value1"},
  {"value":"value2"},
  {"value":"value3"},
  {"value":"value4"},
  {"value":"value5"},
  {"value":"value6"}
];

The second question was an extension of the first. It required writing a getValueList(fromIndex, toIndex) function that calls getBatch, which returns a promise. When calling getValueList as shown below, the result should match the previous question’s result (you can use the first question as a helper function).

getValueList(1, 3).then(result => console.log(result));

const expected = [
  {"value":"value0"},
  {"value":"value1"},
  {"value":"value2"},
  {"value":"value3"},
  {"value":"value4"},
  {"value":"value5"},
  {"value":"value6"}
];

const getBatch = (index) => {
  return new Promise((resolve, reject) => {
    if (index === 1) {
      resolve([
        {
          value: "value0",
          children: []
        }
      ]);
    } else if (index === 2) {
      resolve([
        {
          value: "value1",
          children: [
            {
              value: "value2",
              children: [
                {
                  value: "value3",
                  children: []
                }
              ]
            },
            {
              value: "value4",
              children: []
            }
          ]
        },
        {
          value: "value5",
          children: []
        }
      ]);
    } else if (index === 3) {
      resolve([
        {
          value: "value6",
          children: []
        }
      ]);
    }
  });
};