A challenge in javascript

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a challenge from basic javascript . my code fulfills all the requirements but one . that is “” After updateRecords(2468, "tracks", "Free") , tracks should have "1999" as the first element.""
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if(value == “”){
delete collection[id][prop];
} else if(prop == “tracks” && id.hasOwnProperty(prop) != true){
collection[id][prop] = [];
collection[id][prop].push(value);
} else if(prop == “tracks” && value !=""){
collection[id][prop].push(value);
} else if(prop != “tracks” && value !=""){
collection[id][prop] = value;
}


// Setup
var collection = {
2548: {
  album: "Slippery When Wet",
  artist: "Bon Jovi",
  tracks: [
    "Let It Rock",
    "You Give Love a Bad Name"
  ]
},
2468: {
  album: "1999",
  artist: "Prince",
  tracks: [
    "1999",
    "Little Red Corvette"
  ]
},
1245: {
  artist: "Robert Palmer",
  tracks: [ ]
},
5439: {
  album: "ABBA Gold"
}
};

// Only change code below this line
function updateRecords(id, prop, value) {
if(value == ""){
delete collection[id][prop];
} else if(prop == "tracks" && id.hasOwnProperty(prop) != true){
collection[id][prop] = [];
collection[id][prop].push(value);
} else if(prop == "tracks" && value !=""){
collection[id][prop].push(value);
} else if(prop != "tracks" && value !=""){
collection[id][prop] = value;
}

return collection;
}

updateRecords(5439, "artist", "ABBA");

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Challenge: Record Collection

Link to the challenge:

a string is not an object, it doesn’t have properties

i need to know why it isn’t working . a description would do.

what should i use then ?

what’s the object you want to test if it has the property or not?

id is just a string