freecodecamp--freecodecamp/curriculum/challenges/english/blocks/daily-coding-challenges-javascript/6a26df3e2988bcdded204895.md

id, title, challengeType, dashedName

id	title	challengeType	dashedName
6a26df3e2988bcdded204895	Challenge 359: Golf Handicap Calculator	28	challenge-359

--description--

Given an array of golf scores and a corresponding array of course par values, return the golfer's handicap index using the following method:

• Calculate the differential for each round by subtracting the par from the score, then return the average of all differentials rounded to one decimal place.

--hints--

calculateHandicap([72, 72, 72], [72, 72, 72]) should return 0.

assert.equal(calculateHandicap([72, 72, 72], [72, 72, 72]), 0);

calculateHandicap([80, 76, 78, 78], [72, 72, 72, 72]) should return 6.

assert.equal(calculateHandicap([80, 76, 78, 78], [72, 72, 72, 72]), 6);

calculateHandicap([42, 45, 46, 44], [36, 36, 36, 36]) should return 8.3.

assert.equal(calculateHandicap([42, 45, 46, 44], [36, 36, 36, 36]), 8.3);

calculateHandicap([85, 80, 76, 79, 82], [72, 72, 72, 71, 71]) should return 8.8.

assert.equal(calculateHandicap([85, 80, 76, 79, 82], [72, 72, 72, 71, 71]), 8.8);

calculateHandicap([41, 50, 48, 52, 46, 49], [35, 37, 35, 37, 35, 37]) should return 11.7.

assert.equal(calculateHandicap([41, 50, 48, 52, 46, 49], [35, 37, 35, 37, 35, 37]), 11.7);

--seed--

--seed-contents--

function calculateHandicap(scores, pars) {

  return scores;
}

--solutions--

function calculateHandicap(scores, pars) {
  const differentials = scores.map((score, i) => score - pars[i]);
  const average = differentials.reduce((sum, d) => sum + d, 0) / differentials.length;
  return Math.round(average * 10) / 10;
}