utils.js

const extractKeys = array => {
  if (array.length === 0) {
    return [];
  }
  let keys = Object.keys(array[0]);
  let isCopy = array.every(element => {
    if (typeof element !== 'object') {
      throw new Error(`Array must be made entirely of objects`);
    }
    return Object.keys(element).every(key => keys.indexOf(key) !== -1);
  })
  if (isCopy) {
    return keys;
  } else {
    throw new Error(`Array's object's keys do not match`);
  }
}

const printQueryResults = array => {
  if (typeof array !== 'object') {
    console.log(array);
    return array;
  }
  if (!Array.isArray(array)) {
    array = [array]
  }
  let keys = extractKeys(array);
  let output = [];
  output.push(`\t${keys.join('\t')}`);
  array.forEach(row => {
    output.push(`\t${Object.keys(row).map(key => row[key]).join('\t')}`);
  });
  output = output.join('\n');
  console.log(output);
  return output;
}