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iOS Swift 2.0 Collections and Control Flow Introduction to Collections Working with Arrays

Posted by Ary de Oliveira
Ary de Oliveira
28,298 Points

Swift

Challenge Task 2 of 4

Now that we have an array declared, since it is a mutable array, we can add and remove items. Let's start by adding two more values to our existing array. There are two ways we can add items to an array and I want you to give both a try. Add one item to the array using the append method.

Remember: We invoke methods on an array using a period or dot. After the dot we write out the method name and a value to append in parentheses following the name.

Add another item to the array by concatenating an array. When concatenating, assign the results of the expression back to arrayOfInts.

arrays.swift 
// Enter your code below

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

var arrayOfInts.append("8")
Ary de Oliveira
Ary de Oliveira
28,298 Points

No like i try

Bummer! Make sure you're using the append method to add another to the array. Hint: Append methods are used like this - someArray.append(someValue)

1 Answer

Martin Wildfeuer
PLUS
Martin Wildfeuer
Courses Plus Student 11,071 Points
Martin Wildfeuer
Martin Wildfeuer
Courses Plus Student 11,071 Points

The problem here is that you are trying to append an element of type String to your array, which, however, is of type [Int]. As you put 8 in double quotes, Swift infers its type as String. If you want to add an Int, just omit the double quotes. The following should work as expected:

var arrayOfInts = [1,2,3,4,5,6,7]
var arrayOfInts.append(8)
Ary de Oliveira
Ary de Oliveira
28,298 Points

Sorry no work

Martin Wildfeuer
Martin Wildfeuer
Courses Plus Student 11,071 Points
Martin Wildfeuer
Martin Wildfeuer
Courses Plus Student 11,071 Points

This is indeed not the entire solution for this task, I just concentrated on the issue you had with the code you posted, that is appending a string to an int array. The assignment asks you to append another int to the array via concatenation.

Give it a try first, feel free to ask if you get stuck, I'll be more than happy to help you then!