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You are given a JSON object representing a part of your musical album collection. Each album has several properties and a unique id number as its key. Not all albums have complete information. Write a function which takes an album's id (like 2548), a property prop (like "artist" or "tracks"), and a value (like "Addicted to Love") to modify the d…
// 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"
}
};
// Keep a copy of the collection for tests
var collectionCopy = JSON.parse(JSON.stringify(collection));
// Only change code below this line
function updateRecords(id, prop, value) {
//if a value is set...
if(value !==""){
//first check if the property is not 'tracks'. If it's anything else, update
//that entry with the new value.
if(prop !== "tracks"){
collection[id][prop] = value;
}
//otherwise if the property IS 'tracks'...
else{
//see if the collection id already has a 'tracks' property. If it does
//push the new value to the array.
if(collection[id].hasOwnProperty("tracks")){
collection[id][prop].push(value);
}
//if there is no tracks property create one and add the array.
else{
var arr = [value];
collection[id][prop] = arr;
}
}
} //end if there's a value
//if there's no value set for the property then delete that property
else{
delete collection[id][prop];
}
return collection;
}
// Alter values below to test your code
updateRecords(5439, "artist", "ABBA");
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