freecodecamp--freecodecamp/curriculum/challenges/english/blocks/daily-coding-challenges-javascript/6a151d32d772271dd2448c2d.md

id, title, challengeType, dashedName

id	title	challengeType	dashedName
6a151d32d772271dd2448c2d	Challenge 311: Spellcaster	28	challenge-311

--description--

Given a string of spell codes you are casting, calculate the total score.

Each character in the string represents a spell:

Code	Spell	Category	Base Score
"f"	Fire	Destruction	3
"l"	Lightning	Destruction	3
"i"	Ice	Control	2
"w"	Wind	Control	2
"h"	Heal	Restoration	1
"s"	Shield	Restoration	1

A combo multiplier is applied based on how many spells in a row have been cast from different categories:

• The first spell always scores at base value.
• Each consecutive spell from a different category than the previous increases the multiplier by 1.
• Casting a spell from the same category as the previous resets the multiplier back to 1.
• The score for each spell is its base score multiplied by the current multiplier.

Return the total score from the sequence of spells.

--hints--

cast("fihwl") should return 33.

assert.equal(cast("fihwl"), 33);

cast("lwswfi") should return 45.

assert.equal(cast("lwswfi"), 45);

cast("wislhfl") should return 37.

assert.equal(cast("wislhfl"), 37);

cast("sihwlih") should return 50.

assert.equal(cast("sihwlih"), 50);

cast("wishlfihwslwifihl") should return 101.

assert.equal(cast("wishlfihwslwifihl"), 101);

--seed--

--seed-contents--

function cast(spells) {

  return spells;
}

--solutions--

function cast(spells) {
  const lookup = {
    f: { category: "destruction", score: 3 },
    l: { category: "destruction", score: 3 },
    i: { category: "control", score: 2 },
    w: { category: "control", score: 2 },
    h: { category: "restoration", score: 1 },
    s: { category: "restoration", score: 1 }
  };

  let total = 0;
  let multiplier = 1;
  let prevCategory = null;

  for (const spell of spells) {
    const { category, score } = lookup[spell];

    if (prevCategory && category !== prevCategory) {
      multiplier++;
    } else {
      multiplier = 1;
    }

    total += score * multiplier;
    prevCategory = category;
  }

  return total;
}