Appending elements to an array

Question

Hi all real newbie question here.

I have an array like this:

 var daysInMonth = Array<([MyCustomClass], NSDate)>()

How can I append an element to this?

I am having difficulty doing so. Trying something like this:

daysInMonth.append([MyCustomClass](), someDate)

or

daysInMonth.append(  ([MyCustomClass](), someDate)   )

will not work (i'd like to add an empty array initial above of type MyCustomClass, as well as some date that I have) but these are failing (error missing parameter #2 in call)

Any thoughts on what I am lacking in my syntax?

Thanks!

I am not sure what you are trying to achieve but it has a bit of a "code smell" about it. Rather than using an array of types it is probably better design to define a new struct that has an array of MyCustomClass and an NSDate and then declaring an array of those structs — Paulw11
– Paulw11, Commented Aug 28, 2014 at 3:42

Anthony Kong · Accepted Answer · 2014-08-28 03:59:51Z

2

It looks like a swift bug to me. The swift compiler cannot correctly parse the "( (...) )" as passing in a tuple to a function.

If I break the append operation into two statements, it works.

var daysInMonth = Array<([MyCustomClass], NSDate)>()

let data = ([MyCustomClass()], NSDate()) // assuming MyCustomClass init() taks no parameter 

daysInMonth.append(data)

note: It was [MyCustomClass]() in your question, which is incorrect.

edited Aug 28, 2014 at 3:59

answered Aug 28, 2014 at 3:54

Anthony Kong

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4 Comments

zaph Over a year ago

Which is better because it is more clear and each statement is doing one thing. But to use the new syntax would be even better.

Anthony Kong Over a year ago

@Zaph Yeah, I expect them to be equivalent. So I am bit surprised by the 'bug' (if it is indeed one)

NullHypothesis Over a year ago

Thanks Anthony. Appreciate your time.

NullHypothesis Over a year ago

@Anthony hey I had a question so apparently by doing [MyCustomClass()] it ends up instantiating a new instance of MyCustomClass() and adding it to the array - this produces an array as the first parameter with one object in the array. I actually don't want that, rather an empty array as the first parameter (later i'm going to add my own values). I was going crazy before I realized this because it always had one extra element in the array (and this was why). If I remove the ()'s it doesn't work (same error). Thanks!

Mike S · Accepted Answer · 2014-08-28 03:40:58Z

1

Try declaring your array using the newer Array syntax instead:

var daysInMonth = [([MyCustomClass], NSDate)]()

Then, this works:

daysInMonth.append(([MyCustomClass](), NSDate()))

answered Aug 28, 2014 at 3:40

Mike S

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