Both assignment lines in the code below give me this error:
'@|value $T5' is not identical to 'String'
func PrintShoppingList(myList: Array<String>)
{
println(myList)
var cabbage = "cabbage"
let fish:String = "fish"
myList[0] = cabbage
myList[1] = fish
}
What is wrong?
Parameters are constants by default and you cannot mutate them. You can change them to var, but this will be a copy of array.
func PrintShoppingList(var myList: Array<String>)
{
println(myList)
var cabbage = "cabbage"
let fish:String = "fish"
myList[0] = cabbage
myList[1] = fish
}
You can also use inout parameter to mutate original value, but remember that array length cannot be extended by superscript, so myList[1] = fish will crash in this case.
func PrintShoppingList(inout myList: Array<String>)
{
println(myList)
var cabbage = "cabbage"
let fish:String = "fish"
myList[0] = cabbage
myList.append(fish)
}
The problem here is that the argument passed to function is by default set as constant and is immutable. So you need to declared it as var to be able to mutate it.
func PrintShoppingList(var myList: Array<String>)
{
println(myList)
var cabbage = "cabbage"
let fish:String = "fish"
myList[0] = cabbage
myList[1] = fish
print(myList)
}
Your app might crash if you pass array with less than 2 elements, since you are accessing myList[0] and myList[1]. So, make sure that your array has at least to elements to pass array to this method.
