gr.js

function getInput() {
  return [
    ['name', 'tags'],
    ['john',' hungry,likes_pizza'],
    ['maggie', 'thirsty, productmanager,likes_pizza'],
    ['sally', 'hungry,thirsty, somethingelse'],
    ['tim', 'productmanager']
  ];
}

// Option 1

function parseInput(input) {
  const headers = input.shift();

  return input.reduce((obj, item) => {
    obj[item[0]] = item[1].replace(/ /g, '').split(',');
    return obj;
  }, {});
}

function getHungryEngineers(parsed) {
  const results = [];

  Object.keys(parsed).forEach((key) => {
    if (parsed[key].includes('hungry')) {
      results.push({ name: key });
    }
  });

  return results;
}

// console.log(parseInput(getInput()));
/* {
  john: [ 'hungry', 'likes_pizza' ],
  maggie: [ 'thirsty', 'productmanager', 'likes_pizza' ],
  sally: [ 'hungry', 'thirsty', 'somethingelse' ],
  tim: [ 'productmanager' ]
} */

console.log(1, getHungryEngineers(parseInput(getInput())));
/* [
  { name: 'john' },
  { name: 'sally' }
] */

// Option 2

function getHungryEngineers2(input) {
  const results = [];

  for (let i = 1; i < input.length; ++i) {
    if (input[i][1].includes('hungry')) {
      results.push({ name: input[i][0] });
    }
  }

  return results;
}

console.log(2, getHungryEngineers2(getInput()));

// Option 3

function parseInput2(input) {
  return {
    getNames: function () {
      const names = [];

      for (let i = 1; i < input.length; ++i) {
        names.push(input[i][0]);
      }

      return names;
    },

    getTags: function () {
      const tags = {};

      for (let j = 1; j < input.length; ++j) {
        let tagSet = input[j][1].replace(/ /g, '').split(',');

        tagSet.forEach((tag) => {
          if (!tags.hasOwnProperty(tag)) tags[tag] = [j];
          else tags[tag].push(j);
        });
      }

      return tags;
    }
  };
}

function getEngineersByTags(input, searchTags) {
  const results = [];
  const names = input.getNames();
  const tags = input.getTags();
  const ids = [];

  searchTags.forEach((tag) => {
    if (tags.hasOwnProperty(tag)) {
      ids.push(...tags[tag]);
    }
  });

  ids.filter((id, index, arr) => arr.indexOf(id) === index)
     .forEach((id) => results.push({ name: names[id] }));

  return results;
}

console.log(3, getEngineersByTags(parseInput2(getInput()), ['hungry', 'thirsty']));