Tally and rank quiz scores

Write one function that totals a list of scores, and another that ranks a list of players by score without disturbing the original list.

Worked example

Here's a similar pair of functions for a community garden's weigh-ins:

function totalYield(weighIns) {
  return weighIns.reduce((sum, amount) => sum + amount, 0);
}

const gardens = [
  { gardener: "Lee", yield: 40 },
  { gardener: "Omar", yield: 55 },
  { gardener: "Priya", yield: 32 },
];

function rankGardens(gardens) {
  return [...gardens].sort((a, b) => b.yield - a.yield);
}

console.log(totalYield([12, 18, 9, 15]));
console.log(rankGardens(gardens));
console.log(gardens);

54
[
  { gardener: 'Omar', yield: 55 },
  { gardener: 'Lee', yield: 40 },
  { gardener: 'Priya', yield: 32 }
]
[
  { gardener: 'Lee', yield: 40 },
  { gardener: 'Omar', yield: 55 },
  { gardener: 'Priya', yield: 32 }
]

totalYield reduces a plain array of numbers into one sum. rankGardens spreads gardens into a brand-new array first ([...gardens]), then sorts that copy - gardens itself, printed last, keeps its original order.

Your task

Write function totalScore(attempts). attempts is an array of numbers (each one a quiz attempt's score). It returns the sum of all of them using .reduce().

Write function rankPlayers(players). Each player is an object { name, score }. It returns a brand-new array of those same player objects, sorted by score from highest to lowest, without changing the order of the players array that was passed in.

Rules

• totalScore([]) returns 0.
• rankPlayers returns a different array object than the one it was given - not the same array, reordered.
• The players array passed in keeps its original order after calling rankPlayers - don't sort it in place.
• If two or more players are tied on score, they keep their original relative order in the ranked result.

What you'll practice

Using .reduce() to total a list of numbers, and copying an array before sorting it so the original stays exactly as it was.

Run it

gonomicon fetch fs-week-2/03-02-tally-and-rank-scores
cd 03-02-tally-and-rank-scores
gonomicon test
gonomicon submit

Hints

1. reduce(...) with a starting value of 0 is the whole of totalScore - no loop needed.
2. Sorting a copy, not the original, means making the copy first: [...players].sort(...), not players.sort(...).
3. JavaScript's sort is stable, so two players with the same score will already come out in their original relative order once you sort a copy correctly - you don't need to handle ties specially.