Tell us what’s happening:
I failed to accomplish this task even though I revised the relevant lectures a couple of times for this challenge. Now that I have its solution, I still fail to understand what is going on at
//This line (i) - An if statement within an if statement? How does this work?
//This line (ii) - In descriptive form, what does this code snippet mean?
if(collection[id][prop]) {
collection[id][prop].push(value);
}
else {
collection[id][prop]=[value];
}
//This line (iii) - Whats going on here?
Your code so far
// 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 (prop === "tracks" && value !== "") {
if(collection[id][prop]) { //This line (i)
collection[id][prop].push(value);
}
else { // This line (ii)
collection[id][prop]=[value];
}
} else if (value !== "") { //This line (iii)
collection[id][prop] = value;
} else {
delete collection[id][prop];
}
return collection;
}
// Alter values below to test your code
updateRecords(5439, "artist", "ABBA");
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.
Link to the challenge:
https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/basic-javascript/record-collection