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iOS

Posted by Nils Garland
Nils Garland
18,416 Points

Swift arrays

Hi! I'm Nils, I am trying to complete a code challenge. Now I tried to click help by the challenge but it would not let me. Anyway what I am trying to do is add an Int type to my array. The message states that I need to add to different Ints to the array but in two different ways. This is what my code looks like and I can't figure out what is wrong with it.

var arrayOfInts = [1,2,3,4,5,6,7]

arrayOfInts.append(8) // This works.

arrayOfInts = arrayOfInts + (9) // The error lies here.

2 Answers

David Papandrew
David Papandrew
8,386 Points
David Papandrew
David Papandrew
8,386 Points

Hi Nils,

You are close to having the right answer. The trick is that you need to add an array to the existing array for the 2nd method to work. So instead of using the parenthesis, use the square brackets.

Specifically: 

arrayOfInts = arrayOfInts + [9] // This adds an array containing a single value to arrayOfInts
Nils Garland
Nils Garland
18,416 Points

Hi David! Thanks for the help but I am still getting an error for some reason.

Oops! It looks like Task 1 is no longer passing.

J.D. Sandifer
J.D. Sandifer
18,813 Points

And once you understand that, you can start using arrayOfInts += [9] as a shorthand for it. (Exact same functionality, just is easier to write.)

J.D. Sandifer
J.D. Sandifer
18,813 Points
J.D. Sandifer
J.D. Sandifer
18,813 Points

Not sure if the challenge has changed, but it now asks for you to initialize the array with only six numbers. Here's code that works since it's clear you have all the info needed to create it (and to help out anyone else who finds this later):

var arrayOfInts = [1,2,3,4,5,6]
arrayOfInts.append(7)
arrayOfInts = arrayOfInts + [8]

The last line could also look like this and still work: arrayOfInts += [8]. (I tested that, too.)