In Solution 1, what is the purpose/meaning of the exclamation point before [object][id] in line 4 of the new code? See line that I refer to below:
} else if (prop === “tracks” && !object[id].hasOwnProperty(“tracks”)) {
// Setup
var collection = {
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’
}
};
// Only change code below this line
function updateRecords(object, id, prop, value) {
return object;
}
updateRecords(collection, 5439, ‘artist’, ‘ABBA’);
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**Challenge:** Record Collection
**Link to the challenge:**
https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/basic-javascript/record-collection