//
// The inupt array is array of objects, each object is in the following format:
// {
//    name: <String>,
//    rank: <Number>,
// }
//

/**
 * Returns the avarage ranking of all the input
 */
const average = (arr) => {
    let sum = 0;
    arr.forEach((element) => {
      sum += element.rank;
    });

    return sum / arr.length;
}

// OR ES6 average
const es6Average = arr => arr.map(a => a.rank).reduce((a, b) => a + b) / arr.length;

/**
 * Return a sorted array based on ranking.
 *
 * Note: this function mutates the original array, and it's not creating a new result array.
 */
const sortArray = (arr) => {
  return arr.sort((a, b) => { return a.rank - b.rank });
}