FLAMES game, written in JavaScript - I liked the logic behind the game and wanted to represent it in code

flames.js

// flames.js
// FLAMES game. Algorithm can be found here: http://flamesgame.appspot.com/algorithm

const getFlame = (name1, name2) =>
  name1.toLowerCase().split('').                                                      // take all characters in "name1", to compare
  filter(c => name2.toLowerCase().includes(c)).                                       // keep only characters (in "name1") also found in "name2"
  reduce((result, c) => [
    result[0].replace(new RegExp(`${c}`, 'g'), ''),                                   // replace common characters in "name1"
    result[1].replace(new RegExp(`${c}`, 'g'), '')                                    // replace common characters in "name2"
  ], [name1.toLowerCase(), name2.toLowerCase()]).
  reduce((length, letters) => [length.shift() + letters.length], [0]).                // determine length of characters left, after removal
  map(length => {
    const findStop = (flames, startAt) => {
      if (flames.length === 1) return flames;                                         // stop, if one flame character is left
      const position = new Array(length).fill(0).                                     // move "length" number of times
        reduce(beginAt => beginAt + 1 > flames.length ? 1 : beginAt + 1, startAt - 1) // determine where to stop, in one move
      flames.splice(position - 1, 1);                                                 // remove the "flame" character where we stopped
      return findStop(flames, position);                                              // find the next stop
    };
    return findStop('FLAMES'.split(''), 1)[0];                                        // begin finding stops
  }).
  map(result =>
    ['Friendship', 'Love', 'Affection', 'Marriage', 'Enemy', 'Sibling'].
      filter(flame => flame.toLowerCase().startsWith(result.toLowerCase()))[0]        // present result in readable form
  )[0];

alert(getFlame('Victor', 'Chisom')); // sample test: "FLAMES" between my wife and I :D *drum_roll* Marriage! \o/

// comment out the next line, to test
// alert(getFlame(prompt('Your name'), prompt('Partner\'s name')));

// test with other names at https://es6console.com/

Goood

❤️