alphabet-wars.js

alphabet-wars.js

function alphabetWar(battlefield) {
    const remaining = [];
    const splitStr = battlefield.split(/(\[[^\]]*\])/g);
    const hasNuke = battlefield.indexOf('#') > -1;
    
    splitStr.forEach((item, idx) => {
      const isInShelter = item.indexOf('[') === 0;

      // the whole thing was put together in like 20 minutes #ripReadability
      if (!hasNuke || isInShelter && (
          !(idx > 0 && /([#][^#]*){2}/.test(splitStr[idx - 1])) &&
          !(idx < splitStr.length - 1 && /([#][^#]*){2}/.test(splitStr[idx + 1])) &&
          !(idx > 0 && idx < splitStr.length - 1 && splitStr[idx - 1].indexOf('#') > -1 && splitStr[idx + 1].indexOf('#') > -1)
        )
      ) {
        if (isInShelter) {
          item = item.slice(1, -1);
        }
        
        item.split('').forEach(letter => remaining.push(letter));
      } 
    });
    
    return remaining.join('');
}

// just to run tests from codewars
Test = {
    assertEquals(a, b) {
        if (a === b) {
            console.log('Test passed');
        }
        else {
            console.log(`Test failed, expected: ${b}, got: ${a}`);
        }
    }
};

Test.assertEquals(alphabetWar('abde[fgh]ijk'), 'abdefghijk');
Test.assertEquals(alphabetWar('ab#de[fgh]ijk'), 'fgh');
Test.assertEquals(alphabetWar('ab#de[fgh]ij#k'), '');
Test.assertEquals(alphabetWar('##abde[fgh]ijk'), '');
Test.assertEquals(alphabetWar('##abde[fgh]'), '');
Test.assertEquals(alphabetWar('##abcde[fgh]'), '');
Test.assertEquals(alphabetWar('abcde[fgh]'), 'abcdefgh');    
Test.assertEquals(alphabetWar('##abde[fgh]ijk[mn]op'), 'mn');
Test.assertEquals(alphabetWar('#abde[fgh]i#jk[mn]op'), 'mn');
Test.assertEquals(alphabetWar('[ab]adfd[dd]##[abe]dedf[ijk]d#d[h]#'), 'abijk');
Test.assertEquals(alphabetWar('[a]#[b]#[c]'), 'ac');
Test.assertEquals(alphabetWar('[a]#b#[c][d]'),'d');
Test.assertEquals(alphabetWar('[a][b][c]'), 'abc');
Test.assertEquals(alphabetWar('##a[a]b[c]#'),'c');