Basic JavaScript - Record Collection

Tell us what’s happening:
Describe your issue in detail here.

Your code so far

// 设置
const recordCollection = {
  2548: {
    albumTitle: 'Slippery When Wet',
    artist: 'Bon Jovi',
    tracks: ['Let It Rock', 'You Give Love a Bad Name']
  },
  2468: {
    albumTitle: '1999',
    artist: 'Prince',
    tracks: ['1999', 'Little Red Corvette']
  },
  1245: {
    artist: 'Robert Palmer',
    tracks: []
  },
  5439: {
    albumTitle: 'ABBA Gold'
  }
};

// 只修改这一行下面的代码
function updateRecords(records, id, prop, value) {
  if(value.length===0){
    delete records.prop;
    return records;
    }
  else if(prop!="tracks"&& !value.length===0){
    let prop=value;
    return records;
    }
  else if(prop="tracks"&& !value.length===0){
    let tracks="";
    tracks[length-1]=value;
    return records;
    }
    return records;
}

updateRecords(recordCollection, 5439, 'artist', 'ABBA');

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Challenge: Basic JavaScript - Record Collection

Link to the challenge:

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