Areba Tier

function arenaTier(gladiatorsInput) {
   const gladiatorsInfo = [...gladiatorsInput];
   const gladiators = {};
   let index = 0;
   let line = gladiatorsInfo[index];

   while (line !== 'Ave Cesar') {
     if (line.includes('vs')) {
       const [firsGladiator, secondGladiator] = line.split(' vs ');

       duel(gladiators, firsGladiator, secondGladiator);
       index++;
       line = gladiatorsInfo[index];
       continue;
     } else {
       addGladiator(line);
     }
     index++;
     line = gladiatorsInfo[index];
   }

   sortAndPrint(gladiators);

   // logic for everything bellow:

   function addGladiator(line) {
     [gladiatorName, technique, skill] = line.split(' -> ');
     let totalSkill = 'totalSkill';
     skill = Number(skill);

     if (!gladiators.hasOwnProperty(gladiatorName)) {
       gladiators[gladiatorName] = {};
       gladiators[gladiatorName][totalSkill] = 0;
     }

     if (!gladiators[gladiatorName].hasOwnProperty(technique)) {
       gladiators[gladiatorName][technique] = skill;
       gladiators[gladiatorName][totalSkill] += skill;
     } else {
       if (skill > gladiators[gladiatorName][technique]) {
         let difference = skill - gladiators[gladiatorName][technique];
         gladiators[gladiatorName][technique] = skill;
         gladiators[gladiatorName][totalSkill] += difference;
       }
     }
   }

   function duel(gladiators, firstGladiator, secondGladiator) {
     const firstExist = gladiators.hasOwnProperty(firstGladiator);
     const secondExist = gladiators.hasOwnProperty(secondGladiator);

     const isValid = (firstG, secondG) => {
       const first = Object.keys(gladiators[firstG]);
       const second = Object.keys(gladiators[secondG]);

       return first.some(
         (element) => element !== 'totalSkill' && second.includes(element)
       );
     };

     if (firstExist && secondExist && isValid(firstGladiator, secondGladiator)) {
       const totalSkill = 'totalSkill';
       if (
         gladiators[firstGladiator][totalSkill] >
         gladiators[secondGladiator][totalSkill]
       ) {
         delete gladiators[secondGladiator];
       } else {
         delete gladiators[firstGladiator];
       }
     }
   }

   function sortAndPrint(gladiators) {
     const sorted = Object.entries(gladiators).sort(
       (a, b) => b[1].totalSkill - a[1].totalSkill || a[0].localeCompare(b[0])
     );
     for (const [name, skills] of sorted) {
       const totalSkills = Object.entries(skills)[0][1];
       delete skills.totalSkill;

       const sortedSkills = Object.entries(skills).sort(
         (a, b) => b[1] - a[1] || a[0].localeCompare(b[0])
       );

       console.log(`${name}: ${totalSkills} skill`);

       for (const [techniqueName, skill] of sortedSkills) {
         console.log(`- ${techniqueName} <!> ${skill}`);
       }
     }
   }
 }