Appending to custom object array in swift

Question

I have an object array like this:

private var _allusers = [Int:User]()

Here User is a custom class. Now, I am calling a PHP file and populating the _allusers object array the first time without any problem. However, I am running into problems IF I try to insert something at the beginning of the _allusers object array.

Generally, this is possible.

private var _intarray = [Int]()
self._intarray.insert(myObject, atIndex:0)

If I try to do the same for the object array I have then it doesn’t work.

self._allusers.insert(myObject, atIndex:0)

It gives me an error stating insert is not a function.

Can someone please help me with this? How can I insert an element at the beginning of the existing object array?

For starters, [Int:User] defines a dictionary, not an array. — David Berry
– David Berry, Commented Jun 28, 2016 at 15:37

Yury · Accepted Answer · 2016-06-28 14:51:51Z

3

The problem is that _allusers is not array, it is Dictionary (unordered type). Depending from what you need, you can use array of tuples for example:

private var _allusers = [(Int, User)]() // this is array

edited Jun 28, 2016 at 14:51

answered Jun 28, 2016 at 14:49

Yury

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3 Comments

Rupshikha Over a year ago

Is there any way of inserting at the beginning of the dictionary since my dictionary index starts from 0 and increases sequentially?

Yury Over a year ago

Your question not have sense. Dictionary is unordered type. You can use array of tuples or of any else data structure if you wish.

Duyen-Hoa Over a year ago

@user3897036 Take a look at Collection Types in this Apple Document: developer.apple.com/library/ios/documentation/Swift/Conceptual/…

David Berry · Accepted Answer · 2016-06-28 15:43:16Z

0

To expand on what Shadow Of is saying, in this case you seem to be stating that you want an array of Users indexed from 0 to N. What you are currently defining is a dictionary which indexes Users with arbitrary indexes over the entire range of Int, so you could have gaps users[0], users[3], users[8] without having users[1] or users[2]. If you truly have consecutive indices, just change your declaration to declare an array instead of a dictionary.

private var _allusers = [User]()

Now, _allusers is an array, the Users are indexed from 0..

_allusers.insert(newUser, atIndex:0)

answered Jun 28, 2016 at 15:43

David Berry

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