Can not access nested array in object

Question

I have an object that is a collection of index numbers. Under each number there are two properties and an array. I am trying to write a function that will accept arguments of the index number, the property to be updated, and the value. So far I can’t figure out how to access the array.

var myObject = 
{
"0001":
  {
  "prop1": ""
  "prop2": ""
  "prop3": []
  }

To access prop1 and prop2 I was able to just use an if statement:

if (prop == "prop1 ")
{
  collection[id].prop1 = value;
}
else if(prop == "prop2")
{
  collection[id].prop2 = value;
}

When I tried to get to the array it fell apart. I tried a few things by the most logical one seemed to be:

 if(prop == "prop3")
 {
   collection[id].prop3.push(value);
 }

Where am I going wrong here?

When I tried to get to the array it fell apart. what error did you got on the console? — gurvinder372
– gurvinder372, Commented Oct 27, 2016 at 14:03

Nina Scholz · Accepted Answer · 2016-10-27 14:06:52Z

0

Maybe you need to create an array first.

if (prop == "tracks") {
    collection[id].tracks = collection[id].tracks || [];
    collection[id].tracks.push(value);
}

answered Oct 27, 2016 at 14:06

Nina Scholz

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6 Comments

B Minster Over a year ago

The array already exists. It is initialized as an empty array.

B Minster Over a year ago

No error, just doesn't update. It almost seems like it's not meeting the conditions of the if statement and just moving on.

Nina Scholz Over a year ago

you could insert a console.log(...) and have a look at the console.

B Minster Over a year ago

Trying to do that. I'm in freecodecamp's environment and so I don't have access to the console unless it throws an error. I also don't have access to the browser's console because of security at my work. I'll have to try that when I get home.

Nina Scholz Over a year ago

you could use alert instead.

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