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Challenge 14: Character Battle

curriculum/challenges/english/blocks/daily-coding-challenges-javascript/6821ebce237de8297eaee790.md

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--description--

Given two strings representing your army and an opposing army, each character from your army battles the character at the same position from the opposing army using the following rules:

  • Characters a-z have a strength of 1-26, respectively.
  • Characters A-Z have a strength of 27-52, respectively.
  • Digits 0-9 have a strength of their face value.
  • All other characters have a value of zero.
  • Each character can only fight one battle.

For each battle, the stronger character wins. The army with more victories, wins the war. Return the following values:

  • "Opponent retreated" if your army has more characters than the opposing army.
  • "We retreated" if the opposing army has more characters than yours.
  • "We won" if your army won more battles.
  • "We lost" if the opposing army won more battles.
  • "It was a tie" if both armies won the same number of battles.

--hints--

battle("Hello", "World") should return "We lost".

js
assert.equal(battle("Hello", "World"), "We lost");

battle("pizza", "salad") should return "We won".

js
assert.equal(battle("pizza", "salad"), "We won");

battle("C@T5", "D0G$") should return "We won".

js
assert.equal(battle("C@T5", "D0G$"), "We won");

battle("kn!ght", "orc") should return "Opponent retreated".

js
assert.equal(battle("kn!ght", "orc"), "Opponent retreated");

battle("PC", "Mac") should return "We retreated".

js
assert.equal(battle("PC", "Mac"), "We retreated");

battle("Wizards", "Dragons") should return "It was a tie".

js
assert.equal(battle("Wizards", "Dragons"), "It was a tie");

battle("Mr. Smith", "Dr. Jones") should return "It was a tie".

js
assert.equal(battle("Mr. Smith", "Dr. Jones"), "It was a tie");

--seed--

--seed-contents--

js
function battle(myArmy, opposingArmy) {

  return myArmy;
}

--solutions--

js
function getStrength(soldier) {
  const soldiers = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
  let strength = 0;

  if (/\d/.test(soldier)) {
    strength = parseInt(soldier);
  } else if (soldiers.includes(soldier)) {
    strength = soldiers.indexOf(soldier) + 1;
  }

  return strength;
}

function battle(myArmy, opposingArmy) {
  if (myArmy.length > opposingArmy.length) return 'Opponent retreated';
  if (opposingArmy.length > myArmy.length) return 'We retreated';

  let myWins = 0;
  let theirWins = 0;

  for (let i = 0; i < myArmy.length; i++) {
    const mySoldier = myArmy[i];
    const theirSoldier = opposingArmy[i];

    const myStrength = getStrength(mySoldier);
    const theirStrength = getStrength(theirSoldier);

    if (myStrength > theirStrength) myWins++;
    if (theirStrength > myStrength) theirWins++;
  }

  return myWins > theirWins ? 'We won' : theirWins > myWins ? 'We lost' : 'It was a tie';
}