function solve(arr) {
    let data = {};

    for (let i = 0; i < arr.length; i++) {
        let row = arr[i];
        row= row.split('|').filter(x=>x!='');

        let color = row[0];
        let secondArg =row[1];
        let thirdArg = row[2];

        if (!data.hasOwnProperty(color)) {
            data[color] = {age: null, name: null, opponents:[], rank:0, win:0, loss:0 };
        }

        if (secondArg=='age') {
            data[color][secondArg] = (thirdArg);
        } else if (secondArg=='name') {
            data[color][secondArg]=thirdArg;
        } else if(secondArg=='win') {
            data[color][secondArg] +=1;
            data[color].opponents.push(thirdArg);
        } else if (secondArg=='loss') {
            data[color][secondArg] +=1;
            data[color].opponents.push(thirdArg);
        }

        //ranks stays 0 until we collect all data
    }

    //take all keys from the object which have no null values for name and age
    let keys = Object.keys(data).filter(x=>data[x].name!=null && data[x].age!=null);


    //create new object and pass valid data to it
    let resultingData = {};
    keys.forEach(x=> resultingData[x] = data[x]);
    Object.keys(resultingData).forEach(x=>{
        resultingData[x].rank=((resultingData[x].win+1)/(resultingData[x].loss+1)).toFixed(2);
        //delete unnecessary properties
        delete resultingData[x].win;
        delete resultingData[x].loss;
        //sort the array of opponents alphabetically
        resultingData[x].opponents.sort((a,b)=> a.localeCompare(b));
    });

    console.log(JSON.stringify(resultingData));
}